SQL query performace help

Hi,
I have a question about the performace of this SQL query. I have to display only 8 rows from this query. How is this query will be executed? What happens if the inside query returns more than 500 rows? Will it slow down?
SELECT * FROM (SELECT prod_date, create_date, prod_name, priority, status FROM CUST_PROD
WHERE cust_id = 100 and Status in(1, 5) order by priority, prod_name ) WHERE ROWNUM < = 8
Thank you..

Its hard to tell what effect more data will have on a query until it happens. As BluShadow pointed out you're not talking about huge amounts of data; with luck the numbers you mentioned will not make any difference.
It looks like you're using the inline view to a top N query. You could look into using the RANK() function to do something similar.

Similar Messages

Cluster bar chart- sql query please help-

Hi,
I am trying to create cluster bar chart and am stumped with this sql query.Any help is appreciated.
Here is my table
city     region      issue     value
c1     north     i1     y
c1     north     i2     y
c2     north     i1     n
c2     north     i2     y
c3     south     i1     y
c3     south     i2     n
c4     east     i1     n
c4     east     i2     n
The bar chart will have 3 series, north south and east.
And labels will be i1 and i2. value will be number of times this issue was encountered(y) in this region.
How can I get something like this from the above table-
region     issue     count(yes)
north     i1     1
north     i2     2
south     i1     1
south     i2     0
east     i1     0
east     i2     0
thanks

WITH table1 AS
(SELECT 1435177 qte_id, 2 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 5 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 7 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 8 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 12 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 14 seq_no
FROM dual
table2 AS
SELECT 1435177 qte_id, 1 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 2 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 3 seq_no, 0 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 4 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 5 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 7 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 8 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 11 seq_no, 59300 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 12 seq_no, 59300 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 14 seq_no, 59300 cmmt_curr_amt
FROM dual
SELECT qte_id, t2_seq_no, cmmt_curr_amt - cmmt_curr_lag diff
FROM
(SELECT t2.qte_id, t2.seq_no t2_seq_no, t1.seq_no t1_seq_no, cmmt_curr_amt, LAG(cmmt_curr_amt,1,0) OVER (PARTITION BY t2.qte_id ORDER BY t2.seq_no) cmmt_curr_lag
FROM table1 t1, table2 t2
WHERE t2.qte_id = t1.qte_id (+)
AND t2.seq_no = t1.seq_no(+)
ORDER BY 1,2
WHERE t1_seq_no IS NOT NULL
ORDER BY 1,2
QTE_ID T2_SEQ_NO DIFF
1435177 2 0
1435177 5 0
1435177 7 0
1435177 8 0
1435177 12 0
1435177 14 0

SQL query tunning help

Hi All,
Could you please help me out the below SQL query tuning .
Temp table is having 1 Million records
Master table is having 60 Million records
Query :
SELECT B.*,U.ID, SD, LE, LAE
FROM client.Temp B, client.Master
U WHERE U.policyno = B.policyno
AND B.UPFLAG = 0
1. Indexes are created on both email columns and Upflag for both tables.
2. Gathered DBMS Stats for MASTER Table
Data is loading 100k/hour on production .

When your query takes too long ...
When your query takes too long ...
HOW TO: Post a SQL statement tuning request - template posting
HOW TO: Post a SQL statement tuning request - template posting

Passing parameter to a SQL query - Please help

Hi All,
I am new to JDBC. I have been trying to pass an external variable to an SQL Query.
The query is
String username1="le";
PreparedStatement pstmt = null;
pstmt = c.prepareStatement("select * from users where USER_NAME like '%?%'");
     pstmt.setString(1, username1);
     pstmt.executeQuery();
     ResultSet rs = pstmt.getResultSet();
I am trying to retrieve values from the users table where the USER_NAME column value that is a String contains the supplied value username1.
I am using the question mark (?) character to pass the value from the variable username1. I am also using the '%' substitution character which matches for any number of characters. So, the above query should retrieve rows where the USER_NAME is something like "charles","leander","Elena" etc.( that contains "le")
I am getting the error:
SQLException: java.sql.SQLException: ORA-01006: bind variable does not exist
I changed the query to
PreparedStatement pstmt = null;
pstmt = c.prepareStatement("select * from users where USER_NAME like '% " + username1 + "%'");
     //pstmt.setString(1, username1);
     pstmt.executeQuery();
This time , it is not giving the error and retrieving properly.
But I want to use the original query and use the "pstmt.setString(1, username1); " . Is there any way of achieving this?
Please help.
Cheers,
charles_am

hi,
try this...
String username1="%le%";
pstmt = c.prepareStatement("select * from users where USER_NAME like ?")
pstmt.setString(1,username1);
cheers,
rpk

Native SQL query - Need help

Hi All,
We have a native SQL query accessing Oracle database(given below).
Can anyone please let me know what this query is about and how can we fine tune the query?
SELECT O.OBJECT_NAME ,
               H.SID,
               HS.MACHINE,
               HS.PROCESS,
               W.SID,
               WS.MACHINE,
               WS.PROCESS,
               H.CTIME,
               W.CTIME,
               WS.ROW_WAIT_OBJ#,
               WS.ROW_WAIT_FILE#,
               WS.ROW_WAIT_BLOCK#,
               WS.ROW_WAIT_ROW#,
               HP.SPID,
               WP.SPID
        FROM V$LOCK H, V$LOCK W, V$LOCK I, V$LOCK I2, ALL_OBJECTS O,
             V$SESSION HS, V$SESSION WS, V$PROCESS HP, V$PROCESS WP
        WHERE   H.ID1 = W.ID1
        AND     H.SID <> W.SID
        AND     H.TYPE IN ('TX','DL')
        AND     H.REQUEST = 0
        AND     H.SID = I.SID
        AND     I.TYPE = 'TM'
        AND     I.ID1 = O.OBJECT_ID
        AND     I.ID1 = I2.ID1
        AND     W.SID = I2.SID
        AND     I2.TYPE = 'TM'
        AND     H.SID = HS.SID
        AND     W.SID = WS.SID
        AND     HS.PADDR = HP.ADDR
        AND     WS.PADDR = WP.ADDR
        INTO :EXCL_LOCK_WAITERS-OBJ_NAME   ,
             :EXCL_LOCK_WAITERS-HOLDER_SID ,
             :EXCL_LOCK_WAITERS-H_HOSTNAME ,
            :EXCL_LOCK_WAITERS-HOLDER_PID ,
             :HOLDER_PID ,
             :EXCL_LOCK_WAITERS-WAITER_SID ,
             :EXCL_LOCK_WAITERS-W_HOSTNAME ,
            :EXCL_LOCK_WAITERS-WAITER_PID ,
             :WAITER_PID ,
             :EXCL_LOCK_WAITERS-HELD_SINCE ,
             :EXCL_LOCK_WAITERS-WAITSSINCE,
             :ROW_WAIT_OBJ,
             :ROW_WAIT_FILE,
             :ROW_WAIT_BLOCK,
             :ROW_WAIT_ROW,
             :H_PROCESS,
             :W_PROCESS
      ENDEXEC
Thanks in advance.
Neethu Mohan

Hi Neethu,
It gives you an overwiew of blocking Oracle sessions.
1. In general, the SQL checks Oracle sessions (SID's) that were requirering a DML lock ('TM') and now holding row locks (TX) to prevent destructive interference of simultaneous conflicting DML or DDL operations. DML statements automatically acquire both table-level locks and row-level locks ('TX') => holders
It joins these with the sessions that are waiting of releasing the lock by the holders => waiters.
2. it retrieves the detail information wich Oracle process , the object (table) , it's row , block and file
are affected by the locks.
3. Normally, the locks are only hold for a short period of time. If you have blocking sessions it may be of a log running task (i.e. mass data update of a table) ; but it could also be a application bug due to improper handling of concurrent updates of the same object.
4. Tuning
V$tables are expensive to query: Why?
v$ tables are generally Oracle memory structures.
v$ tables are not read consistent.
v$ tables require latches to access -- cannot modify and read memory at the same
time.
heavy access to v$ tables like this may cause some serious heavy duty contention.
Especially if you self join V$lock several times.
So the best would be to save the contents of V$LOCK in some table:
Create table mylocks as select * from v$lock;
Use that table for self-joining and joins to the other tables.
You can also CTAS the other v$ tables to bypass the performance bottleneck while retrieving
v$ directly.
You can empty or drop the created tables any time for new data.
Because you want to investigate only lock hold for a longert time to copy the v$ memory structures into
physical tables is not a disadvantage. You certainly will wait longer on finishing your query
instead of copy them into the tables.
Hope this helped
yk

I need to denormalize data in sql query, please help!

With the query
select ref, start_time, end_time, person
from appointments
I get, eg:
REF START_TIME END_TIME PERSON
1234 10:00 11:00 USER1
1234 10:00 11:00 USER2
The users want to see it like this:
REF START_TIME END_TIME PERSON
1234 10:00 11:00 USER1, USER2
How do I do this just in sql?
cheers
Tracey.

Apologies, my mistake, I forgot to connect by the ref as well...
(Note: you can ignore the CAST to VARCHAR2(40) as that just helped me get the formatted output.)
SQL> ed
Wrote file afiedt.buf
1 with t as (select 1234 as ref, '10:00' as start_time, '11:00' as end_time, 'USER1' as person from dual union all
2             select 1234, '10:00', '11:00', 'USER2' from dual union all
3             select 345, '11:00', '12:00', 'USER3' from dual)
4 -- END OF TEST DATA
5 select ref, start_time, end_time, CAST(MAX(LTRIM(SYS_CONNECT_BY_PATH(person,', '),', ')) AS VARCHAR2(40)) as users
6 from (select ref, start_time, end_time, person
7              ,row_number() over (partition by ref, start_time, end_time order by person) rn
8        from t) t
9 CONNECT BY rn = PRIOR rn+1 AND ref = PRIOR ref
10 START WITH rn = 1
11* GROUP BY ref, start_time, end_time
SQL> /
       REF START END_T USERS
      1234 10:00 11:00 USER1, USER2
       345 11:00 12:00 USER3
SQL>

Single sql query-please help

Hi experts,
what i want to do is write a single query which will show whether a employee
exits in the company or not.I have two tables emp and dept.There are as follows.
SQL> select * from emp;
NAME DEPTNO EMPNO
xxx 10 33036
YYY 12 2345
ZZZ 13 678
KKK 14 5678
RRR 15 7865
SQL> select * from dept;
DEPTNO LOCATION
10 AAA
11 BBB
12 CCC
13 DDD
what i want is it will select records from the emp table and find whether corrosponding
deptno really exists in the dept table.If the value is found in deptno column the dept table then it will set the value
Y other wise it will be N and all i have to do with the help of a single query.
expected result
name empno exists
xxx 33036 Y
YYY 2345 Y
ZZZ 678 Y
KKK 5678 N
RRR 7865 N
Please help.
Regards
Rajat

SELECT EMPNO, NAME , EMPNO , NVL( ( SELECT 'Y' FROM    DEPT WHERE EMP.DEPTNO=DEPT.DEPTNO),'N') EXIST
FROM EMP
ORDER BY 1
Demo
SQL> WITH EMP AS(
2 SELECT 'XXX' NAME , 10 DEPTNO ,33036 EMPNO FROM DUAL UNION
3 SELECT 'YYY', 12, 2345 FROM DUAL UNION
4 SELECT 'ZZZ', 13 ,678 FROM DUAL UNION
5 SELECT 'KKK', 14 ,5678 FROM DUAL UNION
6 SELECT 'RRR', 15 ,7865 FROM DUAL ),
7 DEPT AS(
8 SELECT 10 DEPTNO,'AAA' DNAME FROM DUAL UNION
9 SELECT 11 ,'BBB' FROM DUAL UNION
10 SELECT 12 ,'CCC' FROM DUAL UNION
11 SELECT 13 ,'DDD'FROM DUAL )
12 SELECT EMPNO, NAME , EMPNO , NVL( ( SELECT 'Y' FROM    DEPT WHERE EMP.DEPTNO=DEPT.DEPTNO),'N')
EXIST
13 FROM EMP
14 ORDER BY 1
15 /
     EMPNO NAM      EMPNO E
       678 ZZZ        678 Y
      2345 YYY       2345 Y
      5678 KKK       5678 N
      7865 RRR       7865 N
     33036 XXX      33036 Y
SQL> Edited by: Salim Chelabi on Dec 7, 2008 4:15 AM

SQL query - syntax help

Hi All,
I have a table that has 2 columns X, and Y.
create table temp(
x number(5);
y number (5);
);I am trying to write a query to check both columns, here is what I mean.
SELECT CASE
             IF X = 1 AND Y = 0 THEN 3
          IF X = 2 AND Y = 1 THEN 4
          IF X = 4 AND Y IS NULL THEN 5
      END AS STATUS
FROM .....temp ...etc.I know what I want but having problems with the syntax.
Thanks in Advance for your help.
I'm using Oracle 11g, SQL Dev 3.0

select case when x = 1 and y = 0 then 3
            when x = 2 and y = 1 then 4
            when x = 4 and y is null then 5
            else null
        end ans
from ...for more on the case syntax see either one of these links.
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/case_statement.htm
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/expressions004.htm

How to add pl sql query into help text of an item.

Hi
In my database i have added comments to the colums. I would like to use this comments in the help text of the items of my application. I have the query but when I use it in the help text attribute it does not execute the query, it presents the query.
Any ideas?

It is probably too late now, but note that if you create your application using the Create Application Wizard and Application Models, based on User Interface Defaults created in the SQL Workshop, any column comments will automatically become application help text.

SQL Query -- Please Help

Table1
QTE_ID     SEQ_NO
1435177     2
1435177     5
1435177     7
1435177     8
1435177     12
1435177     14
Table2
QTE_ID     SEQ_NO     CMMT_CURR_AMT
1435177     1     98500
1435177     2     98500
1435177     3     0
1435177     4     98500
1435177     5     98500
1435177     7     98500
1435177     8     98500
1435177     11     59300
1435177     12     59300
1435177     14     59300
The result should be
QTE_ID     SEQ_NO     CMMT_CURR_AMT
1435177     2     0 (where 0 = cmmt_curr_amt of seq 2 - cmmt_curr_amt of seq 1 from table 2)
1435177     5     0 (where 0 = cmmt_curr_amt of seq 5 - cmmt_curr_amt of seq 4 from table 2)
1435177     7     0 (where 0 = cmmt_curr_amt of seq 7 - cmmt_curr_amt of seq 5 from table 2)
1435177     8     0 (where 0 = cmmt_curr_amt of seq 8 - cmmt_curr_amt of seq 7 from table 2)
1435177     12     0 (where 0 = cmmt_curr_amt of seq 12 - cmmt_curr_amt of seq 11 from table 2)
1435177     14     0 (where 0 = cmmt_curr_amt of seq 14 - cmmt_curr_amt of seq 12 from table 2)
I have to get the difference of cmmt_curr_amt from the table2 from seq 14 to seq 12 for seq14 in table 1.
Please help me in writing the query.
Thanks in advance.
Srinivas

WITH table1 AS
(SELECT 1435177 qte_id, 2 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 5 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 7 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 8 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 12 seq_no
FROM dual
UNION ALL
SELECT 1435177 qte_id, 14 seq_no
FROM dual
table2 AS
SELECT 1435177 qte_id, 1 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 2 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 3 seq_no, 0 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 4 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 5 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 7 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 8 seq_no, 98500 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 11 seq_no, 59300 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 12 seq_no, 59300 cmmt_curr_amt
FROM dual
UNION ALL
SELECT 1435177 qte_id, 14 seq_no, 59300 cmmt_curr_amt
FROM dual
SELECT qte_id, t2_seq_no, cmmt_curr_amt - cmmt_curr_lag diff
FROM
(SELECT t2.qte_id, t2.seq_no t2_seq_no, t1.seq_no t1_seq_no, cmmt_curr_amt, LAG(cmmt_curr_amt,1,0) OVER (PARTITION BY t2.qte_id ORDER BY t2.seq_no) cmmt_curr_lag
FROM table1 t1, table2 t2
WHERE t2.qte_id = t1.qte_id (+)
AND t2.seq_no = t1.seq_no(+)
ORDER BY 1,2
WHERE t1_seq_no IS NOT NULL
ORDER BY 1,2
QTE_ID T2_SEQ_NO DIFF
1435177 2 0
1435177 5 0
1435177 7 0
1435177 8 0
1435177 12 0
1435177 14 0

What's wrong with this sql query? Help

hi
i am having difficulty executing this query
ResultSet s=st.executeQuery("select * from employee where iden = ?"+id);
here in my program st is statement obg
iden is attribute name in table
id i am getting at run time from user
please help...it says wrong number of parameters
thank you

That's correct, get rid of the Question mark. Questions marks are used in PreparedStatements, but they are also used in pattern matching. I am assuming the iden is the table identity. Therefore, I am assuming it is numeric. If so, you can't use the question mark because pattern matching is only done with strings. If you are treating your statement as a PreparedStatement, then you have done it wrong. (See the API) Here is a code snippet from the API:PreparedStatement pstmt =
con.prepareStatement("UPDATE EMPLOYEES SET SALARY = ? WHERE ID = ?");
pstmt.setBigDecimal(1, 153833.00)
pstmt.setInt(2, 110592)It seems you are using a Statement object, so, you need to get rid of that question mark.
tajenkins

SQL Query, please help very urgent

I am a newbie is sql.
I have two tables called test_master and test_detail.
Both tables contains pos_id as common field.
In test_detail got sub_id and to get the people under a given pos_id, I join with pos_id of test_master.
In the where condition, when I give the pos_id, it's returning only
the first level. How can I get the second level and get all the levels?
Any help is highly appreciable.It's very urgent.
Looking forward to hear from you.
Thanks
Newbie

Ok, I am pasting the description of the master and detail in the order.
Master
EMPLOYEE_NO VARCHAR2(30)
ORGANIZATION_ID NUMBER(15)
ORGANIZATION_NAME VARCHAR2(240)
POSITION_ID NUMBER(15)
POSITION_NAME VARCHAR2(240)
Detail
POSITION_ID NUMBER(15)
SUBORDINATE_ID NUMBER(15)
ORGANIZATION_ID NUMBER(15)
POSITION_NAME VARCHAR2(50)
Here is the sql, I want to get all the subordinates under a given position_id of the master.
Looking forward to hear from you.
select a.employee_no,a.POSITION_ID,a.POSITION_NAME,a.EMPLOYEE_NAME,
b.position_id,b.subordinate_id from portal_employee_master_test a,
portal_structure_test b
where a.POSITION_ID = b.POSITION_ID and a.POSITION_ID='xyz'
and b.position_ID=a.POSITION_ID

SQL query urgent helps needed!!!

Hi all,
I got the following query :-
SELECT RH.REQUEST_NUMBER,
     MSIK.CONCATENATED_SEGMENTS,
MSIK.DESCRIPTION,
     RL.FROM_SUBINVENTORY_CODE,
     RL.UOM_CODE,
     RL.QUANTITY,
PP.FULL_NAME     ,
     M.TRANSACTION_QUANTITY
FROM     MTL_TXN_REQUEST_HEADERS RH,
MTL_TXN_REQUEST_LINES RL,
     MTL_SYSTEM_ITEMS_KFV MSIK,
FND_USER FU,
PER_PEOPLE_V7 PP,
          ( SELECT MSIK2.CONCATENATED_SEGMENTS, MOQ.SUBINVENTORY_CODE, SUM(MOQ.TRANSACTION_QUANTITY)
          FROM MTL_ONHAND_QUANTITIES MOQ, MTL_SYSTEM_ITEMS_KFV MSIK2
          WHERE MSIK2.INVENTORY_ITEM_ID = MOQ.INVENTORY_ITEM_ID
          AND MSIK2.ORGANIZATION_ID = 8
          AND MOQ.SUBINVENTORY_CODE LIKE 'ST%'
          GROUP BY MSIK2.CONCATENATED_SEGMENTS, MOQ.SUBINVENTORY_CODE) M
WHERE
RH.HEADER_STATUS IN(3,7,8)
AND RH.MOVE_ORDER_TYPE IN(1,2)
and rh.header_id = rl.header_id
AND MSIK.INVENTORY_ITEM_ID = RL.INVENTORY_ITEM_ID
AND MSIK.ORGANIZATION_ID = 8
AND RL.FROM_SUBINVENTORY_CODE LIKE 'ST%'
AND RH.CREATED_BY = FU.USER_ID
AND FU.EMPLOYEE_ID = PP.PERSON_ID
However, when I try to run I got the invalid column for m.transaction_quantity ??? why? does it b'cos of the group sum that I used ?
My intention of this query to display the sum of total qty from the mtl_onhand_quantities table.
Please helps.
Thanks.
Rgds
Lim

sorry if its too late.....
my guess is alias the SUM(MOQ.TRANSACTION_QUANTITY) in the sub-query table (M) as TRANSACTION_QUANTITY.
-------- code snippet---------
FND_USER FU,
PER_PEOPLE_V7 PP,
( SELECT MSIK2.CONCATENATED_SEGMENTS, MOQ.SUBINVENTORY_CODE,
SUM(MOQ.TRANSACTION_QUANTITY) TRANSACTION_QUANTITY <------------------------------------This is important
FROM MTL_ONHAND_QUANTITIES MOQ, MTL_SYSTEM_ITEMS_KFV MSIK2
WHERE MSIK2.INVENTORY_ITEM_ID = MOQ.INVENTORY_ITEM_ID
AND MSIK2.ORGANIZATION_ID = 8
AND MOQ.SUBINVENTORY_CODE LIKE 'ST%'
GROUP BY MSIK2.CONCATENATED_SEGMENTS, MOQ.SUBINVENTORY_CODE) M
WHERE
RH.HEADER_STATUS IN(3,7,8)
AND RH.MOVE_ORDER_TYPE IN(1,2)
--------------code snippet ends------------------------
hope this helps,

I am struck up with the sql query pleas help me

Hi,
i am struck up with this query
select cpuid,hostid,timestamp from
system_Cpu
where hostid='dscp02469' AND cpuid='second'
CPUID HOSTID TIMESTAMP
second dscp02469 29:jun:2006:18:30:18
second dscp02469 29:jun:2006:18:31:04
second dscp02469 29:jun:2006:18:32:53
second dscp02469 29:jun:2006:18:40:39
second dscp02469 29:jun:2006:18:41:26
second dscp02469 29:jun:2006:18:42:31 (top entry)
i have to get top five minutes records
CPUID HOSTID TIMESTAMP
second dscp02469 29:jun:2006:18:40:39
second dscp02469 29:jun:2006:18:41:26
second dscp02469 29:jun:2006:18:42:31
i am writing this query
select cpuid,hostid,timestamp from system_Cpu where hostid='dscp02469' AND cpuid='second' having max(timestamp)-timestamp<5/1440
having max(timestamp)-timestamp<5/1440
ERROR at line 2:
ORA-00979: not a GROUP BY expression
Message was edited by:
user517983

You seem to be offended...
Well, here is what I tried out (and then posted)...
SQL> select cpuid,hostid,to_char(timestamp, 'dd/mon/yyyy hh24:mi:ss') FROM(select cpuid,hostid,times
tamp, max(timestamp) over () maxts from system_Cpu where hostid='dscp02469' AND cpuid='second' )WHER
E maxts-timestamp<5/1440 ;
CPUID HOSTID TO_CHAR(TIMESTAMP,'D
second dscp02469 29/jun/2006 18:40:39
second dscp02469 29/jun/2006 18:41:26
second dscp02469 29/jun/2006 18:42:31And just to display time component, I modified it a bit...
SQL> select cpuid,hostid,to_char(timestamp, 'dd/mon/yyyy hh24:mi:ss') FROM(select cpuid,hostid,times
tamp, max(timestamp) over () maxts from system_Cpu where hostid='dscp02469' AND cpuid='second' )WHER
E maxts-timestamp<5/1440 ;
CPUID HOSTID TO_CHAR(TIMESTAMP,'D
second dscp02469 29/jun/2006 18:40:39
second dscp02469 29/jun/2006 18:41:26
second dscp02469 29/jun/2006 18:42:31It worked for me. BTW, the way I interpreted the OP's requirement was-give all records that are within 5 minutes interval from the top (or max) timestamp.
I may be wrong...

SQL query join help

I have two tables DEVICE and CONTACT. The tables are joined DEVICE_ID to CONTACT_ID. I want to print device_ID and the corresponding contact info with the lowest CONTACT.PRIORITY.
SQL> describe DEVICE;
DEVICE_ID              NOT NULL VARCHAR2(50)
SQL> describe CONTACT;
CONTACT_ID               NOT NULL VARCHAR2(50)
CONTACT_TYPE             NOT NULL VARCHAR2(4)
PRIORITY                 NOT NULL DOUBLE PRECISION
LASTNAME                 NOT NULL VARCHAR2(30)
FIRSTNAME                NOT NULL VARCHAR2(80)
SQL> SELECT a.DEVICE_ID, b.LASTNAME,b.PRIORITY from DEVICE a, CONTACT b where a.DEVICE_ID = 'DEVICEA' and a.DEVICE_ID=b.CONTACT_ID(+);
DEVICE_ID              LASTNAME    FIRSTNAME PRIORITY CONTACT_TYPE
DEVICEA                CONTACT1     GN               1 ROUT
DEVICEA                CONTACT2     Hans             2 ROUTHow do I print just one record with the lowest CONTACT.PRIORITY?
Thanks
Ravi

rmalghan wrote:
Thanks Frank, Sundar and Sean. I got the below 3 to work. Two questions. My DEVICE table has 31936 records.
1. The first one returned 30207, 2nd 31936 records and 3rd one 30348. Since the 2nd one result looks like what I expected, the 1st and 3rd one seem to be missing some records. For troubleshooting, I tried to limit the query for a few devices, but can't seem to figure why the difference. Any suggestions? The 2nd query is not checking for CONTACT_TYPE = 'ROUT', so it's not surprising that it returns more rows.
The 3rd query is effectively doing an inner join. The condition "WHERE c.rnum = 1" is being applied after the join, so it rejects all the rows that were added because of the outer join (that is, where all the columns from c are NULL). You probably meant:
LEFT OUTER JOIN got_rnum c ON d.DEVICE_ID     = c.CONTACT_ID
                           AND c.rnum          = 1; without a WHERE clause.
2. Is there benefit in terms of efficiency. The 2nd one does seem to run faster so I am guessing that is the best. Any comments?
SELECT a.DEVICE_ID, b.LASTNAME,b.FIRSTNAME,b.PRIORITY
FROM DEVICE a, CONTACT b
where
a.DEVICE_ID=b.CONTACT_ID(+) and
b.CONTACT_TYPE = 'ROUT' and
b.PRIORITY = (select min(b1.PRIORITY ) from CONTACT b1 where b1.CONTACT_ID = b.CONTACT_ID);
30207 rows selected (10.12 seconds)
SELECT DEVICE_ID, LASTNAME, PRIORITY
FROM (
SELECT a.DEVICE_ID, b.LASTNAME, b.PRIORITY, ROW_NUMBER() OVER (PARTITION BY a.DEVICE_ID ORDER BY b.PRIORITY) row_num
from DEVICE a, CONTACT b
where a.DEVICE_ID=b.CONTACT_ID(+))
WHERE row_num = 1;
31936 rows selected (6.68 seconds)
WITH got_rnum AS (
SELECT LASTNAME, FIRSTNAME, PRIORITY, CONTACT_TYPE, CONTACT_ID,
ROW_NUMBER () OVER ( PARTITION BY CONTACT_ID ORDER BY priority) AS rnum
FROM contact
where CONTACT_TYPE = 'ROUT'
SELECT d.DEVICE_ID, c.LASTNAME, c.FIRSTNAME, c.PRIORITY
FROM device d
JOIN got_rnum c ON d.DEVICE_ID     = c.CONTACT_ID(+)
WHERE c.rnum = 1;
30348 rows selected (9.07 seconds)
Timing that way isn't very accurate. Whichever one you run first is apt to be slower, because the data is less likely to be cached in memory.
The 2nd query has only 3 columns in the result set. That probably doesn't change the speed much, but you should fix it anyway.

SQL query performace help

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