Problem with subquery
Hi all
I'm having problem with select statement .I want to return only one row of data having the ealiest serv_start_date,latest serv_end_date and smallest ref_no.This is my data:
ACCT_NO CHILD_ACCT_NO SERV_STAR SERV_END_ SERV_NO
X700026640404 X700143120108 06-JUL-05 31-DEC-06 10268947
X700026640404 X700143120207 01-JUN-05 05-APR-06 10268949
X700026640404 X700143120306 01-JUN-05 05-APR-06 10268950
X700026640404 X700143120405 01-JUN-05 05-APR-06 10268951
X700026640404 X700143120504 01-JUN-05 05-APR-06 10268952
X700026640404 X700143120603 01-JUN-05 05-APR-06 10268953
X700026640404 X700143120702 01-JUN-05 05-APR-06 10268954
X700026640404 X700143120801 01-JUN-05 05-APR-06 10268955
X700026640404 X700143120910 06-JUL-05 31-DEC-06 10268956
X700026640404 X700143121205 19-AUG-05 31-DEC-06 14900166
so as u can see,the earlist start_date is '01-JUN-05' and contains 7 rows of it.Then i need to check the latest serv_end_date for each 7 rows and it's all the same,then i need to check the smallest serv_no of the 7 rows which is 10268949
So i need to return only this row
ACCT_NO CHILD_ACCT_NO SERV_STAR SERV_END_ SERV_NO
X700026640404 X700143120207 01-JUN-05 05-APR-06 10268949
How to solve it?
Please help...tq in advance
Does this satisfy your requirement?
SQL> SELECT ACCT_NO, SERV_START, MIN (SeRV_END_DT), MIN (SERV_NO)
FROM (SELECT 'X700026640404' ACCT_NO, 'X700143120108' CHILD_ACCT_NO, '06-JUL-05' SERV_START,
'31-DEC-06' SERV_END_DT, '10268947' SERV_NO
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120207', '01-JUN-05', '05-APR-06', '10268949'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120306', '01-JUN-05', '05-APR-06', '10268950'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120405', '01-JUN-05', '05-APR-06', '10268951'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120504', '01-JUN-05', '05-APR-06', '10268952'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120603', '01-JUN-05', '05-APR-06', '10268953'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120702', '01-JUN-05', '05-APR-06', '10268954'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120801', '01-JUN-05', '05-APR-06', '10268955'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143120910', '06-JUL-05', '31-DEC-06', '10268956'
FROM DUAL
UNION
SELECT 'X700026640404', 'X700143121205', '19-AUG-05', '31-DEC-06', '14900166'
FROM DUAL) DATA
GROUP BY acct_no, serv_start;
ACCT_NO SERV_STAR MIN(SERV_ MIN(SERV
X700026640404 01-JUN-05 05-APR-06 10268949
X700026640404 06-JUL-05 31-DEC-06 10268947
X700026640404 19-AUG-05 31-DEC-06 14900166Edit: Please use PL/SQL for such questions.
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.....4..db block gets
.15687..consistent gets
....59..physical reads
.....0..redo size
223313..bytes sent via SQL*Net to client
.38276..bytes received via SQL*Net from client
...343..SQL*Net roundtrips to/from client
.....3..sorts (memory)
.....0..sorts (disk)
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.....1..recursive calls
.....1..db block gets
.20525..consistent gets
....72..physical reads
...120..redo size
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.38281..bytes received via SQL*Net from client
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.....0..sorts (disk)
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SQL> alter session set "_old_connect_by_enabled" = TRUE;
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4 START WITH id IN
5 (
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Slow connect by ... start with subquery in 9i
Has anyone come across a performance problem (compared to 8i) when using hierarchical queries where the START WITH list is generated by a subquery? The culprit seems to be an extra visit to the subquery block as part of the CONNECT BY WITH FILTERING operation.
For example, take a simple tree structure:
CREATE TABLE tree
id NUMBER,
parentid NUMBER
CONSTRAINT tree_pk PRIMARY KEY (id)
...and a subquery - here just a table called sample with a subset of the ids from the tree table:
CREATE TABLE sample
id NUMBER,
CONSTRAINT sample_pk PRIMARY KEY (id)
...with which to drive the start points of the treewalk:
SELECT parentid, id, label
FROM tree
CONNECT BY PRIOR parentid = id
START WITH id IN
SELECT id FROM SAMPLE
With the tables populated and analyzed, I get this from 8i:
Execution Plan
.0......SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1 Bytes=19)
.1....0...CONNECT BY
.2....1.....NESTED LOOPS (Cost=1 Card=1280 Bytes=10240)
.3....2.......INDEX (FAST FULL SCAN) OF 'ID_PK' (UNIQUE) (Cost=1 Card=1280 Bytes=5120)
.4....2.......INDEX (UNIQUE SCAN) OF 'TREE_PK' (UNIQUE)
.5....1.....TABLE ACCESS (BY USER ROWID) OF 'TREE'
.6....1.....TABLE ACCESS (BY INDEX ROWID) OF 'TREE' (Cost=2 Card=1 Bytes=19)
.7....6.......INDEX (UNIQUE SCAN) OF 'TREE_PK' (UNIQUE) (Cost=1 Card=1)
Statistics
.....0..recursive calls
.....4..db block gets
.15687..consistent gets
....59..physical reads
.....0..redo size
223313..bytes sent via SQL*Net to client
.38276..bytes received via SQL*Net from client
...343..SQL*Net roundtrips to/from client
.....3..sorts (memory)
.....0..sorts (disk)
..5120..rows processed
and this is 9i:
Execution Plan
.0......SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1 Bytes=19)
.1....0...CONNECT BY (WITH FILTERING)
.2....1.....NESTED LOOPS
.3....2.......NESTED LOOPS (Cost=2 Card=1280 Bytes=10240)
.4....3.........INDEX (FAST FULL SCAN) OF 'ID_PK' (UNIQUE) (Cost=2 Card=1280 Bytes=5120)
.5....3.........INDEX (UNIQUE SCAN) OF 'TREE_PK' (UNIQUE)
.6....2.......TABLE ACCESS (BY USER ROWID) OF 'TREE'
.7....1.....NESTED LOOPS
.8....7.......BUFFER (SORT)
.9....8.........CONNECT BY PUMP
10....7.......TABLE ACCESS (BY INDEX ROWID) OF 'TREE' (Cost=2 Card=1 Bytes=19)
11...10.........INDEX (UNIQUE SCAN) OF 'TREE_PK' (UNIQUE) (Cost=1 Card=20480)
12....1.....INDEX (UNIQUE SCAN) OF 'SAMPLE_PK' (UNIQUE) (Cost=1 Card=1 Bytes=4)
Statistics
.....1..recursive calls
.....1..db block gets
.20525..consistent gets
....72..physical reads
...120..redo size
224681..bytes sent via SQL*Net to client
.38281..bytes received via SQL*Net from client
...343..SQL*Net roundtrips to/from client
.....9..sorts (memory)
.....0..sorts (disk)
..5120..rows processed
..so, about another 5000 logical reads, corresponding to the extra access of the sample table at the bottom of the query plan. So instead of just visiting the START WITH subquery once, to kick off the treewalk, I seem to be revisiting it for every row returned. Not too bad if that happens to be a unique index scan as here but that's not always the case.
I know I've got new options for re-writing this as a join under 9i, I'm just curious about those extra lookups and why they're necessary.
Cheers - AndrewHi Andrew,
Just noticed you message. I have exact same performance problem. It's just killing ant other processes and runs forever.
Could you please share you experience how to deal with "CONNECT BY" in 9i and also could you please tell about this option to re-write CONNECT BY as a join?
Thank you very much,
Victor -
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values (7, 39609, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 07:00:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 11:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (8, 39609, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 07:00:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 11:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (9, 118327, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (10, 120033, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('04-03-2008', 'dd-mm-yyyy'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (11, 120033, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('04-03-2008', 'dd-mm-yyyy'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (12, 120033, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (13, 120033, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (14, 126690, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 18:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 21:15:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (15, 126690, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 12:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 16:45:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (16, 126690, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 12:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 21:15:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (17, 126690, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 16:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 18:45:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (18, 126690, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 16:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 18:45:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (19, 169241, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 05:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 14:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (20, 169241, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 05:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 14:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (21, 169241, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (22, 169241, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (23, 200716, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (24, 200716, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (25, 200716, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (26, 252836, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (27, 252836, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (28, 252836, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (29, 252836, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 17:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 19:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (30, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 07:00:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 10:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (31, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 10:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 14:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (32, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 05:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 07:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (33, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 07:15:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 10:35:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (34, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 07:15:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 10:35:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (35, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 05:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 14:00:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (36, 260774, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 07:00:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 10:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (37, 289039, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 16:30:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:15:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (38, 289039, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 13:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 22:15:00', 'dd-mm-yyyy hh24:mi:ss'), 'I');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (39, 289039, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 13:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 16:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'A');
insert into testsched (SEQ, EMPL_ID, SCHED_DT, START_DT_TM, END_DT_TM, REC_STAT)
values (40, 289039, to_date('03-03-2008', 'dd-mm-yyyy'), to_date('03-03-2008 13:45:00', 'dd-mm-yyyy hh24:mi:ss'), to_date('03-03-2008 16:30:00', 'dd-mm-yyyy hh24:mi:ss'), 'U');
========================= Problem Statement =======================================
Problem Statement:
Select all employees whose active schedule (rec_stat = 'A') start date & time falls
between "16:30" and "17:45".
An employee may be having multiple schedules on a day. It may be continuous or may be
having breaks in between the schedules.
If an employee schedule is continuous then the minimum schedule start date & time is
considered as the start date & time of the work.
If an employee is having breaks in the schedule, then each schedule start date & time is
considered as start date & time.
e.g:-1
1 39609 2008/03/03 2008/03/03 07:00:00 2008/03/03 11:00:00 A
2 39609 2008/03/03 2008/03/03 11:00:00 2008/03/03 11:30:00 A
In above case, the employee schedule is continuous. The start date & time is 2008/03/03 07:00:00
e.g:-2
19 169241 2008/03/03 2008/03/03 05:30:00 2008/03/03 14:00:00 A
21 169241 2008/03/03 2008/03/03 17:30:00 2008/03/03 22:00:00 A
In above case, the employee is having a break in between. Then both records
start date & time (i.e. 2008/03/03 05:30:00, 2008/03/03 05:30:00 ) is considered
as start date & time.
e.g:-3
30 260774 2008/03/03 2008/03/03 07:00:00 2008/03/03 10:30:00 A
31 260774 2008/03/03 2008/03/03 10:30:00 2008/03/03 14:00:00 A
32 260774 2008/03/03 2008/03/03 05:30:00 2008/03/03 07:00:00 A
In above case, the employee schedule is continuous. The start date & time is 2008/03/03 05:30:00
========================= Query to test Individual Employees =======================================
Query-1: Test query to see the CASE and LEAD function works fine. If "CAL = 0" means that all
schedules are continuous and the employee needs to ignored.
SELECT fw.*,
CASE WHEN LEAD(FW.END_DT_TM, 1)
OVER(ORDER BY FW.START_DT_TM DESC ) IS NULL AND
fw.start_dt_tm BETWEEN
TO_DATE('03/03/2008 16:30:00','mm/dd/yyyy hh24:mi:ss') AND
TO_DATE('03/03/2008 17:45:00','mm/dd/yyyy hh24:mi:ss')
THEN Fw.seq
WHEN LEAD(FW.END_DT_TM, 1)
OVER(ORDER BY FW.START_DT_TM DESC) != FW.START_DT_TM AND
fw.start_dt_tm BETWEEN
TO_DATE('03/03/2008 16:30:00','mm/dd/yyyy hh24:mi:ss') AND
TO_DATE('03/03/2008 17:45:00','mm/dd/yyyy hh24:mi:ss')
THEN Fw.seq
ELSE 0
END AS "CAL"
FROM TESTSCHED fw
WHERE fw.empl_id = 289039
and fw.rec_stat = 'A'
Query Results
SEQ EMPL_ID SCHED_DT START_DT_TM END_DT_TM REC_STAT CAL
37 289039 2008/03/03 2008/03/03 16:30:00 2008/03/03 22:15:00 A 0
39 289039 2008/03/03 2008/03/03 13:45:00 2008/03/03 16:30:00 A 0
Since all "CAL" column is zero, the employee should be ignored.
========================= Query to be used in the application =======================================
Query-2: Actual Query executed in the application which is not working. Query-1 is used as subquery
here.
SELECT
F1.SEQ,
F1.EMPL_ID,
F1.SCHED_DT,
F1.START_DT_TM,
F1.END_DT_TM,
F1.REC_STAT
FROM TESTSCHED F1
WHERE F1.SEQ IN
(SELECT CASE
WHEN LEAD(FW.END_DT_TM, 1)
OVER(ORDER BY FW.START_DT_TM DESC) IS NULL AND
FW.START_DT_TM BETWEEN
TO_DATE('03/03/2008 16:30:00', 'mm/dd/yyyy hh24:mi:ss') AND
TO_DATE('03/03/2008 17:45:00', 'mm/dd/yyyy hh24:mi:ss') THEN FW.SEQ
WHEN LEAD(FW.END_DT_TM, 1)
OVER(ORDER BY FW.START_DT_TM DESC) != FW.START_DT_TM AND
FW.START_DT_TM BETWEEN
TO_DATE('03/03/2008 16:30:00', 'mm/dd/yyyy hh24:mi:ss') AND
TO_DATE('03/03/2008 17:45:00', 'mm/dd/yyyy hh24:mi:ss') THEN FW.SEQ
ELSE 0
END
FROM TESTSCHED FW
WHERE FW.EMPL_ID = F1.EMPL_ID
AND FW.REC_STAT = 'A')
Query-2 Results
SEQ EMPL_ID SCHED_DT START_DT_TM END_DT_TM REC_STAT
9 118327 2008/03/03 2008/03/03 17:30:00 2008/03/03 22:00:00 A
12 120033 2008/03/03 2008/03/03 17:30:00 2008/03/03 19:30:00 A
17 126690 2008/03/03 2008/03/03 16:45:00 2008/03/03 18:45:00 A
21 169241 2008/03/03 2008/03/03 17:30:00 2008/03/03 22:00:00 A
24 200716 2008/03/03 2008/03/03 17:30:00 2008/03/03 22:00:00 A
28 252836 2008/03/03 2008/03/03 17:30:00 2008/03/03 19:30:00 A
37 289039 2008/03/03 2008/03/03 16:30:00 2008/03/03 22:15:00 A
Problem with Query-2 Results:
Employee IDs 126690 & 289039 should not appear in the List.
Reason: Employee 126690: schedule start date & time is 2008/03/03 12:45:00 and falls outside
"16:30" and "17:45"
14 126690 2008/03/03 2008/03/03 18:45:00 2008/03/03 21:15:00 A
17 126690 2008/03/03 2008/03/03 16:45:00 2008/03/03 18:45:00 A
15 126690 2008/03/03 2008/03/03 12:45:00 2008/03/03 16:45:00 A
Reason: Employee 289039: schedule start date & time is 2008/03/03 13:45:00 and falls outside
37 289039 2008/03/03 2008/03/03 16:30:00 2008/03/03 22:15:00 A
39 289039 2008/03/03 2008/03/03 13:45:00 2008/03/03 16:30:00 AYour LEAD function is order by fw.start_dt_tm, in your first sql, the where clause limited the records return to REC_STAT = A and EMPL_ID = 289039.
In your 2nd query, there is no where clause, so to the LEAD function, the next record after seq 37 is seq 38 which has an end date of 2003-03-03 10:15 pm, not equal to the start time of record seq 37.
Message was edited by:
user477455 -
Multiple equility with subquery
The following query gives error, I thought I can match multiple columns with subquery, how can I achive this problem?
select * from answers where (survey_seq_id, main_group_id, sub_group_id) in
(select survey_seq_id, main_group_id, sub_group_id from surveys s join answers a on s.survey_id = a.survey_seq_id
where s.qa = 2 and a.main_group_id = 62
group by survey_seq_id, sub_group_id having sum(decode(answer, 'Yes', 1, 0)) != 1);
ORA-00979: bir GROUP BY ifadesi değil
00979. 00000 - "not a GROUP BY expression"
*Cause:
*Action:
Error at Line: 12 Column: 27thanks a lot.First step lets format your query nicely
select *
from answers
where (
survey_seq_id
, main_group_id
, sub_group_id
) in
select survey_seq_id
, main_group_id
, sub_group_id
from surveys s
join answers a
on s.survey_id = a.survey_seq_id
where s.qa = 2
and a.main_group_id = 62
group
by survey_seq_id
, sub_group_id
having sum(decode(answer, 'Yes', 1, 0)) != 1
Now if you see the query inside IN there are 3 columns in SELECT list and only 2 in GROUP BY list. And your error clearly says +00979. 00000 - "not a GROUP BY expression"+
main_group_id in the SELECT list is not used in the GROUP BY list
And to add further your query can be simplified as
select *
from (
select a.*
, sum(decode(answer, 'Yes', 1, 0)) over(partition by survey_seq_id, main_group_id, sub_group_id) sum_val
from answers a
join surveys s
on s.survey_id = a.survey_seq_id
where s.qa = 2
and a.main_group_id = 62
where sum_val != 1;Edited by: Karthick_Arp on Feb 11, 2013 3:05 AM
Added SQL With analytic function
Edited by: Karthick_Arp on Feb 11, 2013 3:28 AM
I missed surveys table in the query :( -
Problem with subqueries returning TIMESTAMP's
I've got problems with some subqueries returning TIMESTAMP values.
I've build a case for easy reproduction, with this query:
SELECT iil.iil_lot_num ,
(SELECT max ( lot_data_validade )
FROM lot
WHERE lot.lot_mat_cod = iil.iil_mat_cod AND
lot.lot_num = iil.iil_lot_num ) as validade
FROM iil
WHERE ( iil.iil_inv_serie = 109 ) and
( iil. iil_inv_num = 16 ) and
( iil.iil_mat_cod = 111 )
When I run it, it gives the error:
General error;-9999 POS(1) System error: invalid_indexorder
knldiag also gives:
2009-07-28 15:03:18 9943 ERR 51080 SYSERROR -9999 invalid_indexorder
I'm running on 7.6.06.03.
Previous versions were giving another message:
SQLCODE: -9999 System error: Otherwise unknown errorcode
If I change max ( lot_data_validade ) to max ( year (lot_data_validade) ), it works. The problem is specifically with fetching that timestamp value from the subquery.
Backup for reproduction of the problem is on:
http://www.tecnova.com.br/maxdb/backup_problem
(i've isolated only the tables involved in the problem, so the backup is tiny -> 4.3MB)HI Elke,
I had the same idea at first but was largely disappointed to find that this 'corrupt index' is indeed a temp. resultset:
--> max() query
OWNER TABLENAME COLUMN_OR_INDEX STRATEGY PAGECOUNT
DBA IIL RANGE CONDITION FOR KEY 61
IIL_INV_SERIE (USED KEY COLUMN)
IIL_INV_NUM (USED KEY COLUMN)
IIL_MAT_COD (USED KEY COLUMN)
INTERNAL TEMPORARY RESULT EQUAL CONDITION FOR KEY 1
IIL_INV_SERIE (USED KEY COLUMN)
DBA LOT NO STRATEGY NOW (ONLY AT EXECUTION TIME)
INTERNAL TEMPORARY RESULT TABLE SCAN 1
RESULT IS COPIED , COSTVALUE IS > 2 E10
The cost expectation is really awesome here...
--> max(year()) query
OWNER TABLENAME COLUMN_OR_INDEX STRATEGY PAGECOUNT
DBA IIL RANGE CONDITION FOR KEY 61
IIL_INV_SERIE (USED KEY COLUMN)
IIL_INV_NUM (USED KEY COLUMN)
IIL_MAT_COD (USED KEY COLUMN)
INTERNAL TEMPORARY RESULT EQUAL CONDITION FOR KEY 1
IIL_INV_SERIE (USED KEY COLUMN)
DBA LOT NO STRATEGY NOW (ONLY AT EXECUTION TIME)
RESULT IS COPIED , COSTVALUE IS
This time the optimizer ran out of words for the expected effort for this query execution...
The problem really seems to be the subquery-select as we can strip down the example to
select (select max(lot_data_validade) maxval
from lot
where lot.lot_mat_cod=111) as maxval
from dual
and still see the error...
regards,
Lars -
Hi All
I have a critical problem with locking
My session 1 does a select for update in a query which has aggregate function. and updates a row.
2 nd session waits till the first session has updated.
But while selecting the data is selects the old data and not the one which Session1 has updated.
Please let me know How do I overcome this .
=======================================================
Session1:
=======================================================
SQL> select * from test123;
NUM S NAME
1 N name1
2 N name2
3 N name3
/***** Here the session 2 waits *********/
SQL> select name from test123 where num = (select min(num) from test123 where status !='Y') for update;
NAME
name1
SQL> update test123 set status = 'Y' where num=1;
1 row updated.
SQL> commit;
Commit complete.
SQL> select * from testing123;
NUM SOURCE SPNAME STATUS
123 Test testing C
SQL> select * from test123;
NUM S NAME
1 Y name1
2 N name2
3 N name3
============================================================================================================
Session 2
============================================================================================================
/**** This happens when Lock is released ***/
SQL> select name from test123 where num = (select min(num) from test123 where status !='Y') for update;
NAME
name1
/*** I do a select again I get the new result .. This is what I should get in first place***/
SQL> l
1* select name from test123 where num = (select min(num) from test123 where status !='Y') for upd
SQL> /
NAME
name2
Thanks
Ashwin N.I'll give the explanation a shot but I can't find anything explict in the documentation along these lines. By default, the 'FOR UPDATE' clause says lock all these rows AND wait for anybody who might already have them locked to release the lock. However, if the other session changed the data we can't just lock the old version of the row, we have to get the data from the new version of the row. The catch is that we must guarantee statement level read consistency as well. Namely, all the data used by the statement must appear correct from a single point in time. If we waited for the other transaction and it commited, we must move that point up to be read consistent. That means reexecuting any subqueries as of the new consistency point. To summarize, the following happens ...
1. subquery gives num = 1
2. main query want to lock that row but can't so it waits
3. other session commits
4. main query notices the data it wants to lock has changed so it moves up consistency point
5. subquery is rerun for the new consistency point
6. subquery now gives num = 2
7. main query locks row
Richard -
I am trying to implement some kind of a server listening for requests. The listener part of the app, is a daemon thread that listens for connections and instantiates a handling daemon thread once it gets some. However, my problem is that i must be able to kill the listening thread at the user's will (say via a sto button). I have done this via the Sun's proposed way, by testing a boolean flag in the loop, which is set to false when i wish to kill the thread. The problem with this thing is the following...
Once the thread starts excecuting, it will test the flag, find it true and enter the loop. At some point it will LOCK on the server socket waiting for connection. Unless some client actually connects, it will keep on listening indefinatelly whithought ever bothering to check for the flag again (no matter how many times you set the damn thing to false).
My question is this: Is there any real, non-theoretical, applied way to stop thread in java safely?
Thank you in advance,
LeftyThis was one solution from the socket programming forum, have you tried this??
public Thread MyThread extends Thread{
boolean active = true;
public void run(){
ss.setSoTimeout(90);
while (active){
try{
serverSocket = ss.accept();
catch (SocketTimeoutException ste){
// do nothing
// interrupt thread
public void deactivate(){
active = false;
// you gotta sleep for a time longer than the
// accept() timeout to make sure that timeout is finished.
try{
sleep(91);
}catch (InterruptedException ie){
interrupt();
} -
Problem with Threads and a static variable
I have a problem with the code below. I am yet to make sure that I understand the problem. Correct me if I am wrong please.
Code functionality:
A timer calls SetState every second. It sets the state and sets boolean variable "changed" to true. Then notifies a main process thread to check if the state changed to send a message.
The problem as far I understand is:
Assume the timer Thread calls SetState twice before the main process Thread runs. As a result, "changed" is set to true twice. However, since the main process is blocked twice during the two calls to SetState, when it runs it would have the two SetState timer threads blocked on its synchronized body. It will pass the first one, send the message and set "changed" to false since it was true. Now, it will pass the second thread, but here is the problem, "changed" is already set to false. As a result, it won't send the message even though it is supposed to.
Would you please let me know if my understanding is correct? If so, what would you propose to resolve the problem? Should I call wait some other or should I notify in a different way?
Thanks,
B.D.
Code:
private static volatile boolean bChanged = false;
private static Thread objMainProcess;
protected static void Init(){
objMainProcess = new Thread() {
public void run() {
while( objMainProcess == Thread.currentThread() ) {
GetState();
objMainProcess.setDaemon( true );
objMainProcess.start();
public static void initStatusTimer(){
if(objTimer == null)
objTimer = new javax.swing.Timer( 1000, new java.awt.event.ActionListener(){
public void actionPerformed( java.awt.event.ActionEvent evt){
SetState();
private static void SetState(){
if( objMainProcess == null ) return;
synchronized( objMainProcess ) {
bChanged = true;
try{
objMainProcess.notify();
}catch( IllegalMonitorStateException e ) {}
private static boolean GetState() {
if( objMainProcess == null ) return false;
synchronized( objMainProcess ) {
if( bChanged) {
SendMessage();
bChanged = false;
return true;
try {
objMainProcess.wait();
}catch( InterruptedException e ) {}
return false;
}Thanks DrClap for your reply. Everything you said is right. It is not easy to make them alternate since SetState() could be called from different places where the state could be anything else but a status message. Like a GREETING message for example. It is a handshaking message but not a status message.
Again as you said, There is a reason I can't call sendMessage() inside setState().
The only way I was able to do it is by having a counter of the number of notifies that have been called. Every time notify() is called a counter is incremented. Now instead of just checking if "changed" flag is true, I also check if notify counter is greater than zero. If both true, I send the message. If "changed" flag is false, I check again if the notify counter is greater than zero, I send the message. This way it works, but it is kind of a patch than a good design fix. I am yet to find a good solution.
Thanks,
B.D. -
Problem with threads running javaw
Hi,
Having a problem with multi thread programming using client server sockets. The program works find when starting the the application in a console using java muti.java , but when using javaw multi.java the program doesnt die and have to kill it in the task manager. The program doesnt display any of my gui error messages either when the server disconnect the client. all works find in a console. any advice on this as I havent been able to understand why this is happening? any comment would be appreciated.
troy.troy,
Try and post a minimum code sample of your app which
does not work.
When using javaw, make sure you redirect the standard
error and standard output streams to file.
Graeme.Hi Graeme,
I dont understand what you mean by redirection to file? some of my code below.
The code works fine under a console, code is supposed to exit when the client (the other server )disconnects. the problem is that but the clientworker side of the code still works. which under console it doesnt.
public class Server{
ServerSocket aServerSocket;
Socket dianosticsSocket;
Socket nPortExpress;
ClientListener aClientListener;
LinkedList queue = new LinkedList();
int port = 0;
int clientPort = 0;
String clientName = null;
boolean serverAlive = true;
* Server constructor generates a server
* Socket and then starts a client threads.
* @param aPort socket port of local machine.
public Server(int aPort, String aClientName, int aClientPort){
port = aPort;
clientName = aClientName;
clientPort = aClientPort;
try{
// create a new thread
aServerSocket = new ServerSocket(port) ;
// connect to the nPortExpress
aClientListener = new ClientListener(InetAddress.getByName(clientName), clientPort, queue,this);
// aClientListener.setDaemon(true);
aClientListener.start();
// start a dianostic port
DiagnosticsServer aDiagnosticsServer = new DiagnosticsServer(port,queue,aClientListener);
// System.out.println("Server is running on port " + port + "...");
// System.out.println("Connect to nPort");
catch(Exception e)
// System.out.println("ERROR: Server port " + port + " not available");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Server port " + port + " not available", JOptionPane.ERROR_MESSAGE);
serverAlive = false;
System.exit(1);
while(serverAlive&&aClientListener.hostSocket.isConnected()){
try{
// connect the client
Socket aClient = aServerSocket.accept();
//System.out.println("open client connection");
//System.out.println("client local: "+ aClient.getLocalAddress().toString());
// System.out.println("client localport: "+ aClient.getLocalPort());
// System.out.println("client : "+ aClient.getInetAddress().toString());
// System.out.println("client port: "+ aClient.getLocalPort());
// make a new client thread
ClientWorker clientThread = new ClientWorker(aClient, queue, aClientListener, false);
// start thread
clientThread.start();
catch(Exception e)
//System.out.println("ERROR: Client connection failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client connection failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end constructor Server
void serverExit(){
JOptionPane.showMessageDialog(null, "Server ","ERROR: nPort Failure", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}// end class Server
*** connect to another server
public class ClientListener extends Thread{
InetAddress hostName;
int hostPort;
Socket hostSocket;
BufferedReader in;
PrintWriter out;
boolean loggedIn;
LinkedList queue; // reference to Server queue
Server serverRef; // reference to main server
* ClientListener connects to the host server.
* @param aHostName is the name of the host eg server name or IP address.
* @param aHostPort is a port number of the host.
* @param aLoginName is the users login name.
public ClientListener(InetAddress aHostName, int aHostPort,LinkedList aQueue,Server aServer) // reference to Server queue)
hostName = aHostName;
hostPort = aHostPort;
queue = aQueue;
serverRef = aServer;
// connect to the server
try{
hostSocket = new Socket(hostName, hostPort);
catch(IOException e){
//System.out.println("ERROR: Connection Host Failed");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort Failed", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end constructor ClientListener
** multi client connection server
ClientWorker(Socket aSocket,LinkedList aQueue, ClientListener aClientListener, boolean diagnostics){
queue = aQueue;
addToQueue(this);
client = aSocket;
clientRef = aClientListener;
aDiagnostic = diagnostics;
} // end constructor ClientWorker
* run method is the main loop of the server program
* in change of handle new client connection as well
* as handle all messages and errors.
public void run(){
boolean alive = true;
String aSubString = "";
in = null;
out = null;
loginName = "";
loggedIn = false;
while (alive && client.isConnected()&& clientRef.hostSocket.isConnected()){
try{
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
if(aDiagnostic){
out.println("WELCOME to diagnostics");
broadCastDia("Connect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
out.println("WELCOME to Troy's Server");
broadCastDia("Connect : client "+client.getInetAddress().toString());
out.flush();
String line;
while(((line = in.readLine())!= null)){
StringTokenizer aStringToken = new StringTokenizer(line, " ");
if(!aDiagnostic){
broadCastDia(line);
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
else{
if(line.equals("GETIPS"))
getIPs();
else{
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
} // end while
catch(Exception e){
// System.out.println("ERROR:Client Connection reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR:Client Connection reset", JOptionPane.ERROR_MESSAGE);
try{
if(aDiagnostic){
broadCastDia("Disconnect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
broadCastDia("Disconnect : client "+client.getInetAddress().toString());
out.flush();
// close the buffers and connection;
in.close();
out.close();
client.close();
// System.out.println("out");
// remove from list
removeThreadQueue(this);
alive = false;
catch(Exception e){
// System.out.println("ERROR: Client Connection reset failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client Connection reset failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end method run
* method run - Generates io stream for communicating with the server and
* starts the client gui. Run also parses the input commands from the server.
public void run(){
boolean alive = true;
try{
// begin to life the gui
// aGuiClient = new ClientGui(hostName.getHostName(), hostPort, loginName, this);
// aGuiClient.show();
in = new BufferedReader(new InputStreamReader(hostSocket.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(hostSocket.getOutputStream()));
while (alive && hostSocket.isConnected()){
String line;
while(((line = in.readLine())!= null)){
System.out.println(line);
broadCast(line);
} // end while
} // end while
catch(Exception e){
// System.out.println("ERRORa Connection to host reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort reset", JOptionPane.ERROR_MESSAGE);
try{
hostSocket.close();
}catch(Exception a){
JOptionPane.showMessageDialog(null, (a.toString()),"ERROR: Exception", JOptionPane.ERROR_MESSAGE);
alive = false;
System.exit(1);
} // end method run -
Problem with threads and camera.
Hi everybody!
I've a problem with taking snapshot.
I would like to display a loading screen after it take snapshot ( sometimes i
have to wait few seconds after i took snapshot. Propably photo is being taken in time where i have to wait).
I was trying to use threads but i didn't succeed.
I made this code:
display.setCurrent(perform);
new Thread(new Runnable(){
public void run() {
while((!performing.isShown()) && (backgroundCamera.isShown())){
Thread.yield();
notifyAll();
}).start();
new Thread(new Runnable(){
public void run() {
try {
this.wait();
} catch(Exception e) {
exceptionHandler(e);
photo = camera.snapshot();
display.setCurrent(displayPhoto);
}).start();This code is sometimes showing performing screen but sometimes no.
I don't know why. In my opinion performing.isShown() method isn't working correctly.
Does anyone have some idea how to use threads here?Hi,
I've finally managed to work this fine.
The code:
Object o = new Object();
display.setCurrent(perform);
new Thread(new Runnable(){
public void run() {
while(!performing.isShown()){
Thread.yield();
synchronized(o) {
o.notify();
}).start();
new Thread(new Runnable(){
public void run() {
try {
synchronized(o) {
o.wait(1);
} catch(Exception e) {
exceptionHandler(e);
photo = camera.snapshot();
display.setCurrent(displayPhoto);
}).start();
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