Complex connect by prior query
I need SQL(for hierarchical tree) for a function which accepts node as input parameter and returns ref cursor.
Following is a sample tree:
1
--2.1
----3.1
------4.1
--------5.1
----------6.1
----------6.2
----3.2
------4.2
--------5.2
--2.2
----3.2
------4.2
--------5.2
----3.3
----3.4
------4.1
--------5.1
----------6.1
----------6.2
1 is at the root level and 2.1 & 2.2 are immediate children and so on.
The output tree should be all related parents and children of the passed node.
e.g:
If the input is 4.1, the output tree will be:
1
--2.1
----3.1
------4.1
--------5.1
----------6.1
----------6.2
--2.2
----3.4
------4.1
--------5.1
----------6.1
----------6.2
If the input is 4.2, the output tree will be:
1
--2.1
----3.2
------4.2
--------5.2
--2.2
----3.2
------4.2
--------5.2
The complex part, I guess, is to remove unwanted(not related) branches from the tree.
Following is the representation of the table RELATIONSHIP
ID PARENT CHILD
1-------1-------2.1
2-------1-------2.2
3-------2.1-----3.1
4-------2.1-----3.2
5-------2.2-----3.2
6-------2.2-----3.3
7-------2.2-----3.4
8-------3.1-----4.1
9-------3.2-----4.2
10------3.4-----4.1
11------4.1-----5.1
12------4.2-----5.2
13------5.1-----6.1
14------5.1-----6.2
Pls. help me out to form this CONNECT BY PRIOR query.
Thanks in advance.
make sure you include 2 things in your queries.
# the row number
# the level
for traversing up the tree set
level = 0 - level and
row_number = 0 - row_number.
you than can then do an order by row_number if you union the two queries
for example:
============
select tbl.child,
tbl.parent,
level lvl,
rownum rn
from some_table tbl
start with tbl.parent = 4.1
connect by prior tbl.child = tbl.parent
union
select tbl.child,
tbl.parent,
0 - level lvl,
0 - rownum rn
from some_table tbl
start with tbl.child = 4.1
connect by prior tbl.parent = tbl.child
order by rn asc
Similar Messages
-
Issue with the below query. The query is not getting filtered for the condition hier_typ_c in('BS') with the connect by prior
query. query is fetching all the hier_type_c in the table like 'BS', 'CO', 'EC' etc....
Just wondering how do i restrict the query just to fetch the type_c ='BS' alone? why is it giving all the records??
Select
Level as LEVEL_CODE,
h.HIER_PRNT_NODE_I as PARENT,
h.HIER_CHLD_NODE_I as CHILD,
h.HIER_CHLD_NODE_X || ' (' || h.HIER_CHLD_NODE_I || ')' as ALIAS
From (Select Distinct HIER_CHLD_NODE_I, HIER_PRNT_NODE_I,
HIER_CHLD_NODE_X from .HIER_DIMN
where hier_typ_c in('BS') and CURR_VER_C = 'Y') h
Start with h.HIER_PRNT_NODE_I = 'ROOT'
Connect by prior
h.HIER_CHLD_NODE_I = h.HIER_PRNT_NODE_I
Order by LEVEL_CODE, parent, childHi
It loks like you're doing it right.
By basing the CONNECT BY query on a sub-query that has this WHERE clasue:
where hier_typ_c in('BS') and CURR_VER_C = 'Y') hyou should exclude not only nodes whose hier_typ_c is not 'BS', but also their descendants.
Post some sample data (CREATE TABLE and INSERT statements) and the results you want from that data.
Are you sure the query you posted is what you're actually running?
I would expect the sub-query FROM clause to cause an error because of the '.'.
from .HIER_DIMNEdited by: Frank Kulash on Sep 29, 2009 11:16 AM -
Strange Behaviour of Connect By Prior query
Has anybody faced a problem like your query returns alternative record like suppose you have 10 records in a table and your connect by prior query gives you 1st, 3rd, 5th and so on. My query was working fine few days back but suddenly its giving me different result. I don't know whether there was some settings changed by someone or not.
Can't guess anything from here. You need to post the query, sample data and the result.
-
Need help: CONNECT by PRIOR query in ora10g
Hi All,
Recently we have migrated the DB from 9i to 10g.
we used to have many rule based queries in 9i
and all are changed based on 10g.
All the queries that have CONNECT BY PRIOR
conditions seems to behave in wrong manner.
( same query in 9i,fetches less number of records where as 10g there were many
rows displayed eventhough it was not selected in where clause.- as per business logic )
After changing the below parameter setting , the problem was solved.
can you tell wts the below setting would do? by doing so , ur again making 10g
to behave like 9i so that full benefit of 10g is not used ?
Alter session set “_optimizer_connect_by_cost_based”=falseHi, try this:
WITH t AS (
SELECT 100 AS node_id, cast(NULL AS NUMBER) AS parent_node_id FROM dual UNION ALL
SELECT 101 AS node_id, 100 AS parent_node_id FROM dual UNION ALL
SELECT 102 AS node_id, 100 AS parent_node_id FROM dual UNION ALL
SELECT 1021 AS node_id, 102 AS parent_node_id FROM dual UNION ALL
SELECT 1022 AS node_id, 102 AS parent_node_id FROM dual UNION ALL
SELECT 10221 AS node_id, 1022 AS parent_node_id FROM dual UNION ALL
SELECT 10222 AS node_id, 1022 AS parent_node_id FROM dual
SELECT DISTINCT CONNECT_BY_ROOT parent_node_id AS ID, node_id AS id1
FROM t
CONNECT BY t.node_id = PRIOR parent_node_id
START WITH parent_node_id = 1022
ORDER BY 1, 2; -
I want to help connect by prior query
table structure
node_id parent_node_id
=======================
100
101 100
102 100
1021 102
1022 102
10221 1022
10222 1022
above example tree like-
100
101
102
1021
1022
10221
10222
i want to output like(if input 1022)
id id1
1022 100
1022 102
1022 1022
1022 10221
1022 10222
create table node_temp(node_id number,parent_node_id number)
insert into node_temp(node_id) values(100);
insert into node_temp(node_id,parent_node_id) values(101,100);
insert into node_temp(node_id,parent_node_id) values(102,100);
insert into node_temp(node_id,parent_node_id) values(1021,102);
insert into node_temp(node_id,parent_node_id) values(1022,102);
insert into node_temp(node_id,parent_node_id) values(10221,1022);
insert into node_temp(node_id,parent_node_id) values(10222,1022);
Edited by: 855516 on Feb 1, 2013 1:46 PMHi, try this:
WITH t AS (
SELECT 100 AS node_id, cast(NULL AS NUMBER) AS parent_node_id FROM dual UNION ALL
SELECT 101 AS node_id, 100 AS parent_node_id FROM dual UNION ALL
SELECT 102 AS node_id, 100 AS parent_node_id FROM dual UNION ALL
SELECT 1021 AS node_id, 102 AS parent_node_id FROM dual UNION ALL
SELECT 1022 AS node_id, 102 AS parent_node_id FROM dual UNION ALL
SELECT 10221 AS node_id, 1022 AS parent_node_id FROM dual UNION ALL
SELECT 10222 AS node_id, 1022 AS parent_node_id FROM dual
SELECT DISTINCT CONNECT_BY_ROOT parent_node_id AS ID, node_id AS id1
FROM t
CONNECT BY t.node_id = PRIOR parent_node_id
START WITH parent_node_id = 1022
ORDER BY 1, 2; -
How to use simple SQL instead of Connect By Prior
Currently, I am using "connect by prior" query in the application, but for reason I don�t want to use this connect by query so can any one please tell how does I get the same result by using SQL, I tried this by using procedure but unable to get the same result, specially LEVEL of the tree.
So please tell, how would I get the correct data.
Thanks in advance,
AMIT.Hi,
Whenever you have a question, it helps to post:
(1) The version of Oracle (and any other relevant software) you're using
(2) A little sample data (just enough to show what the problem is) from all the relevant tables
(3) The results you want from that data
(4) Your best attempt so far (formatted) I don't believe the unformated code you posted is what you're really running, since it has a syntax error ("... WHERE START WITH ..."). Please post code that really works with the sample data you posrted.
(5) The full error message (if any), including line number
Executable SQL statements (like "CREATE TABLE AS ..." or "INSERT ..." statements) are best for (2).
If you can present your problem using commonly available tables (for example, scott.emp, which contains a hierarchy), then you can omit (2).
Formatted tabular output is okay for (3). Type these 6 characters
{code}
(small letters only, inside curly brackets) before and after the tabular text, to preserve spacing.
As Alex said, why don't you want to use CONNECT BY?
Are you getting the correct results now, but just looking for a different way of getting them?
Depending on your exact requirements, you could write a PLSQL function that mimics LEVEL. Don't expect it to be fast.
Nested Sets is a completely different way of modeling trees.
Some things are much easier with Nested Sets than they are using the Adjacency Model (the parent-child model that uses CONNECT BY).
But some things are much harder with Nested Sets, and LEVEL is one of them. -
Help with 'connect by prior' statement
I've got a quoting report that is sporadically ordering incorrectly and I've traced the source down to a 'connect by prior' statement. Can I get an explanation of what the statement is doing so I can figure out how to change it to get the desired results?
select rownum config_rownum, quote_line_id,related_quote_line_id rlid, level
from aso_line_relationships
where relationship_type_code = 'CONFIG'
connect by prior related_quote_line_id = quote_line_idsample output for the line_ids for one quote:
CONFIG_ROWNUM QUOTE_LINE_ID RLID LEVEL
1 7438 7439 2
2 7440 7441 2
3 7430 7431 2
4 7432 7433 2
5 7432 7434 2
6 7432 7435 2
7 7436 7437 2
8 7442 7443 2
9 7442 7444 2
10 7442 7445 2
11 7442 7446 2
12 7442 7447 2
13 7442 7448 2
14 7442 7449 2
15 7450 7451 2
16 7452 7453 2
17 7452 7454 2
18 7452 7455 2
19 7456 7457 2
20 7456 7458 2
21 7456 7459 2
22 7460 7461 2
23 7460 7462 2
24 7463 7464 2
25 7430 7431 1
26 7432 7433 1
27 7432 7434 1
28 7432 7435 1
29 7436 7437 1
30 7438 7439 1
31 7440 7441 1
32 7442 7443 1
33 7442 7444 1
34 7442 7445 1
35 7442 7446 1
36 7442 7447 1
37 7442 7448 1
38 7442 7449 1
39 7450 7451 1
40 7452 7453 1
41 7452 7454 1
42 7452 7455 1
43 7456 7457 1
44 7456 7458 1
45 7456 7459 1
46 7460 7461 1
47 7460 7462 1
48 7463 7464 1 The correct ordering can be seen by running this statement:
select rownum config_rownum, quote_line_id,related_quote_line_id rlid
from aso_line_relationships
where relationship_type_code = 'CONFIG' and quote_line_id between 7430 and 7464
CONFIG_ROWNUM QUOTE_LINE_ID RLID
1 7430 7431
2 7432 7433
3 7432 7434
4 7432 7435
5 7436 7437
6 7438 7439
7 7440 7441
8 7442 7443
9 7442 7444
10 7442 7445
11 7442 7446
12 7442 7447
13 7442 7448
14 7442 7449
15 7450 7451
16 7452 7453
17 7452 7454
18 7452 7455
19 7456 7457
20 7456 7458
21 7456 7459
22 7460 7461
23 7460 7462
24 7463 7464I tried to substitute the simple query above for the 'connect by prior' query in the report but failed because something in the report is expecting input from the 'connect by prior' statement. So eliminating the statement is not a choice."connect by prior " is for for hierarchical queries which is for data has parent-children relationship, and ususlly its' result is used to populate tree-like data result. and order by is NOT recommend since it will destroy the hierarchical order.
you could use "order by sibiling" if you would like to order inside the same level of data -
Variable being lost after CONNECT BY...PRIOR query
Im having an issue with the following code (snippet posted):
SELECT ewpm_project_id INTO pro_id FROM ewpm_work_package WHERE
ewpm_work_package_id = wp_id;
--can return pro_id here
SELECT ewpm_work_package_prefix, LEVEL INTO parent_prefix,
parent_level
FROM ewpm_work_package
WHERE ewpm_project_id = temp_pro_id
AND ewpm_work_package_id = wp_id
START WITH ewpm_work_package_id = pack_id
CONNECT BY PRIOR ewpm_work_package_id = ewpm_work_package_parent_id;
RETURN pro_id;
The pro_id value is correctly set during the first select statement, I
can return the pro_id in the commented position. However, I can not
return the value after the second select statement. All I am getting
back is a null value. If I remove the START WITH.. CONNECT BY
clauses in the second query, the pro_id value is returned correcly.
Has anyone experienced this before, or know what could be causing it?However, I can not
return the value after the second select statement. All I am getting
back is a null value. If I remove the START WITH.. CONNECT BY
clauses in the second query, the pro_id value is returned correcly.How do you use this function ? If you use it in SQL query then any
SQL statement raising NO_DATA_FOUND exception leads to NULL returning
as a result (like the subquery in a selection list which returns no one row):
SQL> create function get_number
2 return number
3 is
4 ret_val number;
5 begin
6
7 select 1 into ret_val from dual;
8 return ret_val;
9 end;
10 /
Function created.
SQL> select get_number from dual;
GET_NUMBER
1
SQL> create or replace function get_number
2 return number
3 is
4 ret_val number;
5 p number;
6 begin
7
8 select 1 into ret_val from dual;
9
10 --This statement raises NO_DATA_FOUND
11 select 1 into p from dual where rownum = 0;
12
13 return ret_val;
14 end;
15 /
Function created.
SQL> select get_number from dual;
GET_NUMBER
----------Check does
SELECT ewpm_work_package_prefix, LEVEL
FROM ewpm_work_package
WHERE ewpm_project_id = temp_pro_id
AND ewpm_work_package_id = wp_id
START WITH ewpm_work_package_id = pack_id
CONNECT BY PRIOR ewpm_work_package_id = ewpm_work_package_parent_id
query return anything ?
Rgds. -
Query tuning for query using connect by prior
I have written following query to fetch the data. The query is written in this format because there are multiple rows, which make one recrd and we need to bring that record into one row.
For one CAT(commented here), this query takes around 4 minutes and fetches 6900 records but when it runs for 3 CAT, it takes 17 mins.
I want to tune this as this has to run for 350 CAT values.
It is doing FTS on the main table. I tried to use different hints like PARALLEL, APPEND (in insert) but nothing worked.
The cost of the query is 51.
Any help/suggestions will be appreciated.
SELECT DISTINCT MIN(SEQ) SEQ,
PT, APP, IT, LR, QT,CD, M_A_FLAG,
STRAGG(REM) REM, -- aggregates the data from different columns to one which is parent
CAT
FROM (WITH R AS (SELECT CAT, SEQ, PT, M_A_FLAG, IT, LR,QT,CD, REM, APP
FROM table1
WHERE REC = '36' AND M_A_FLAG = '1'
--AND CAT = '11113')
SELECT CAT, SEQ,
CONNECT_BY_ROOT PT AS PT,
CONNECT_BY_ROOT APP AS APPL,
M_A_FLAG,
CONNECT_BY_ROOT IT AS IT,
CONNECT_BY_ROOT LR AS LR,
CONNECT_BY_ROOT QT AS QT,
CONNECT_BY_ROOT CD AS CD,
REM
FROM R A
START WITH PT IS NOT NULL
CONNECT BY PRIOR SEQ + 1 = SEQ
AND PRIOR CAT = CAT
AND PT IS NULL)
GROUP BY PT, APP, IT,LR, QT, CD, M_A_FLAG, CAT
ORDER BY SEQ;
Thanks.
Edited by: user2544469 on Feb 11, 2011 1:12 AMThe following threads detail the approach and information required.
Please gather relevant info and post back.
How to post a SQL tuning request - HOW TO: Post a SQL statement tuning request - template posting
When your query takes too long - When your query takes too long ... -
CONNECT BY PRIOR and performance of Query Plan
Anyone,
I have an SQL Statement that is performing rather slow and I am trying to figure out if I could optimize it. Here is the SQL:
SELECT/*+ index(MAXIMO.EQNDX99) */
maximo.equipment.eqnum, maximo.equipment.parent, LEVEL
FROM maximo.equipment@maxi_dblink
WHERE parent = :b1 CONNECT BY PRIOR eqnum = parent
ORDER BY eqnum, LEVELAfter some research in this board I followed some advice found to create an index on the table for both the eqnum, parent and the parent, eqnum. EQNDX99 and EQNDX999 respectivley.
Now the Qery Plan for this query shows the following:
SELECT STATEMENT (REMOTE)
SORT (ORDER BY)
FILTER
CONNECT BY
INDEX (FAST FULL SCAN) EQNDX99 (NON-UNIQUE)
TABLE ACESS (BY USER ROWID) EQUIPMENT
INDEX (RANGE SCAN) EQNDX999 (NON-UNIQUE)Now it appears to be using both indexes but it is operating through a DBLINK. Is there anything else I can do to increase performance??? It appears to be using the HINT through the link as well.
Thanks for any help I can get,
David Millerhow long does it takes to complete the query?
-
Connect by prior (hierarchical query)
Hi All,
Some1 asked me a question which goes like this:
Source
emp_no dep_no
110 10
110 20
110 30
110 40
120 10
130 10
130 20
write a query to achieve the following output from the above source
emp_no dept_no
110 10203040
120 10
130 1020
Now I have come across solutions with 'connect by prior' clauses but I am nt able to understand how oracle is producing that result , Could someone point me to a good article or text that can explain this concept very thoroughly( I have searched on google and got to see many articles but I couldnt able to understand it since these articles were not explaining everything)
Regards
RahulYou can try this:
SQL> ed
Wrote file afiedt.buf
1 SELECT deptno,MAX(TRIM(SUBSTR(SYS_CONNECT_BY_PATH(empid,','),2)))
2 KEEP(DENSE_RANK LAST ORDER BY deptno) FROM
3 (SELECT deptno,empid,ROW_NUMBER() OVER(PARTITION BY deptno ORDER BY deptno) curr,
4 ROW_NUMBER() OVER(PARTITION BY deptno ORDER BY deptno) - 1 prev
5 FROM emp)
6 CONNECT BY PRIOR curr = prev
7 AND deptno = PRIOR deptno
8 START WITH curr = 1
9* group by deptno
SQL> /
DEPTNO MAX(TRIM(SUBSTR(SYS_CONNECT_BY_PATH(EMPID,','),2)))KEEP(DENSE_RANKLASTORDERBYDEPTNO)
10 1,2,3,4
20 5,6,7
SQL> select deptno,empid from emp;
DEPTNO EMPID
10 1
10 2
10 3
10 4
20 5
20 6
20 7
7 rows selected.
SQL> -
Problem Creating a query for a hierarchical tree. [using connect by prior]
Hi all,
I have 2 tables.
box (box_id, box_name)
item(item_id, item_name, box_id)
In a box there are several items.
I want to create a hierachical tree to display items that are present in each box.
LIKE:
|---BOX1
| |----ITEM 1
| |----ITEM 2
|
|---BOX2
| |----ITEM 1
| |----ITEM 2
Currently i am trying this query:
SELECT -1 state, box_name, 'icon' icon, box_id val
from box b, item i;
I don't know what value to put for level, i don't know how to code the 'connect by prior' part.
Could you please advise me?
Michaël.
PS. Then i will eventually use this query in forms builder.Note the name of this forum is "SQL Developer *(Not for general SQL/PLSQL questions)*" - so only for issues with the SQL Developer tool. Please post these questions under the dedicated SQL And PL/SQL forum.
Regards,
K. -
what is mean by CONNECT TO PRIOR? is it SQL keyword?
i have tried following query....
select level,max(sal) from emp
where level=2
connect to prior sal>sal
group by level
please explain above query........
thanx ....check this also
http://www.oracle.com/technology/oramag/oracle/05-may/o35asktom.html -
Connect by Prior in Oracle 8i question
Need help with building tree-structured query in Oracle 8i (Forms 6i front end if it matters).
Sample structure and data:
CREATE TABLE table_list
my_code NUMBER,
my_level NUMBER,
my_description VARCHAR2(60)
CREATE TABLE table_content
my_code NUMBER,
term_code NUMBER,
term_category VARCHAR2(5)
INSERT into table_list values (101, 1, 'building');
INSERT into table_list values (102, 2, 'flat');
INSERT into table_list values (103, 3, 'living room');
INSERT into table_list values (104, 3, 'bedroom');
INSERT into table_list values (105, 3, 'bathroom');
commit;
INSERT into table_content values (101, 102, 'Sub');
INSERT into table_content values (102, 103, 'Sub');
INSERT into table_content values (102, 104, 'Sub');
INSERT into table_content values (102, 105, 'Sub');
commit;
Need to display data in the following order:
101 'building' --level one
102 'flat' --level two
105 'bathroom' --level three
104 'bedroom' --level three
103 'living room' --level three
*(note alphabetical order in level three)*
Looks like Oracle 8i does not support table joins for CONNECT BY PRIOR. Please advise!And you are correct, it does not display level 1. Do
you think this is this a database structure problem
or it could be corrected via query modification?No and yes. It's not a "structure" problem, its a data problem (as I explained above). You always fix data problems by making queries overly complex (hint, hint, I don't suggest doing it this way).
select tl.my_level, tl.my_description , LPAD(' ',3*(my_level-1)) || substr(tl.my_description, 1, 30) description
from table_list tl,
(select term_Code from table_content
start with my_code in (select my_code from table_list where my_level=1)
connect by prior term_code = my_code
) x
where x.term_code = tl.my_code
union all
select my_level, my_description
from table_list
where my_level = 1
order by 1, 2
better to add a row to table_content with my_code=null, term_code=101.
otherwise you'll be pulling stupid nonsense like above with every query from here on out. -
Hi,
We are writing some complex query using Connect by Prior in it.
When we execute this query on same version of database as that of our client, then the query is executing.
But when we execute this query at client's side then it raises error -
ORA-00600: internal error code, arguments: [kkqcbydrv:1] , [] , [] , [] , [] , [] , [] , []
After searching on metalink,
We could find two workarounds -
1. Use a /*+no_unnest*/ hint, but this may have perfomance implications.
2. alter session set "_optimizer_connect_by_cost_based"=false;
of which we cant use second workaround as this query is called from a application and not directly from oracle prompt.
We are working with the first workaround, but what is wondering us is that,
If same query can work well on our side then why is this query not performing in same way at client's side?
We are using same version of database, same amount of data is present in development and production databases.
Then what is causing this error only in priduction?
Any help in this regard is appreciated.
Thanks,
Av.You can use the second tip in a database login trigger. But if the metalink ORA-600 diagnostic tool can only give you those workarounds I suggest raising a SR to try and get the bug fixed.
It may be differing patch levels that cause the difference between the two sites, some subtle difference in temp tablespace, a corrupt block - impossible for us to say but maybe not for Oracle.
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