How to return in pl/sql the tuples of an sql query comming several tables
I have a select query whose result comes from several tables. The question is how to return the tuples of the select query using a pl/sql function. In othe words, is it possible to define a construct structure to store the values of sql query and return that construct. if yes how to define such a construct where its elements comming from several tables.
I appreciate very much ur help
The way to return a resultset from a function is with a cursor variable. The lazy of doing this is using a weakly-typed ref cursor (in 9i use the predefined SYS_REFCURSOR).
Cheers, APC
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petes1234 -
Need help with query joining several tables into a single return line
what i have:
tableA:
puid, task
id0, task0
id1, task1
id2, task2
tableB:
puid, seq, state
id0, 0, foo
id0, 1, bar
id0, 2, me
id1, 0, foo
id2, 0, foo
id2, 1, bar
tableC:
puid, seq, date
id0, 0, 12/21
id0, 1, 12/22
id0, 2, 12/22
id1, 0, 12/23
id2, 0, 12/22
id2, 1, 12/23
what i'd like to return:
id0, task0, 12/21, 12/22, 12/22
id1, task1, 12/23, N/A, N/A
id2, task2, 12/22, 12/23, N/A
N/A doesn't mean return the string "N/A"... it just means there was no value, so we don't need anything in this column (null?)
i can get output like below through several joins, however i was hoping to condense each "id" into a single line...
id0, task0, 12/21
id0, task0, 12/22
id0, task0, 12/23
id1, task1, 12/23
is this possible fairly easily?
Edited by: user9979830 on Mar 29, 2011 10:53 AM
Edited by: user9979830 on Mar 29, 2011 10:58 AMHi,
Welcome to the forum!
user9979830 wrote:
what i have:...Thanks for posting that so clearly!
Whenever you have a question, it's even better if you post CREATE TABLE and INSERT statements for your sample data, like this:
CREATE TABLE tablea
( puid VARCHAR2 (5)
, task VARCHAR2 (5)
INSERT INTO tablea (puid, task) VALUES ('id0', 'task0');
INSERT INTO tablea (puid, task) VALUES ('id1', 'task1');
INSERT INTO tablea (puid, task) VALUES ('id2', 'task2');
CREATE TABLE tablec
( puid VARCHAR2 (5)
, seq NUMBER (3)
, dt DATE -- DATE is not a good column name
INSERT INTO tablec (puid, seq, dt) VALUES ('id0', 0, DATE '2010-12-21');
INSERT INTO tablec (puid, seq, dt) VALUES ('id0', 1, DATE '2010-12-22');
INSERT INTO tablec (puid, seq, dt) VALUES ('id0', 2, DATE '2010-12-22');
INSERT INTO tablec (puid, seq, dt) VALUES ('id1', 0, DATE '2010-12-23');
INSERT INTO tablec (puid, seq, dt) VALUES ('id2', 0, DATE '2010-12-22');
INSERT INTO tablec (puid, seq, dt) VALUES ('id2', 1, DATE '2010-12-23');This way, people can re-create the problem and test their ideas.
It doesn't look like tableb plays any role in this problem, so I didn't post it.
Explain how you get the results from that data. For example, why do you want this row in the results:
PUID TASK DT1 DT2 DT3
id0 task0 12/21/2010 12/22/2010 12/22/2010rather than, say
PUID TASK DT1 DT2 DT3
id0 task0 12/22/2010 12/21/2010 12/22/2010? Does 12/21 have to go in the first column because it is the earliest date, or is it because 12/21 is related to the lowest seq value? Or do you even care about the order, just as long as all 3 dates are shown?
Always say what version of Oracle you're uisng. The query below will work in Oracle 9 (and up), but starting in Oracle 11, the SELECT ... PIVOT feature could help you.
i can get output like below through several joins, however i was hoping to condense each "id" into a single line... Condensing the output, so that there's only one line for each puid, sounds like a job for "GROUP BY puid":
WITH got_r_num AS
SELECT puid
, dt
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ORDER BY seq -- and/or dt
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, MIN (CASE WHEN r.r_num = 3 THEN r.dt END) AS dt3
, MIN (CASE WHEN r.r_num = 4 THEN r.dt END) AS dt4
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ORDER BY a.puid
;I'm guessing that you want the dates arranged by seq; that is, for each puid, the date related to the lowest seq comes first, regardless of whther that date is the earliest date for that puid or not. If that's not what you need, then change the analytic ORDER BY clause.
This does not assume that the seq values are always consecutive integers (0, 1, 2, ...) for each puid. You can skip, or even duplicate values. However, if the values are always consecutive integers, starting from 0, then you could simplify this. You won't need a sub-query at all; just use seq instead of r_num in the main query.
Here's the output I got from the query above:
PUID TASK DT1 DT2 DT3 DT4
id0 task0 12/21/2010 12/22/2010 12/22/2010
id1 task1 12/23/2010
id2 task2 12/22/2010 12/23/2010As posted, the query will display the first 4 dts for each puid.
If there are fewer than 4 dts for a puid, the query will still work. It will leave some columns NULL at the end.
If there are more than 4 dts for a puid, the query will still work. It will display the first 4, and ignore the others.
There's nothing special about the number 4; you could make it 3, or 5, or 35, but whatever number you choose, you have to hard-code that many columns into the query, and always get that many columns of output.
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PL/SQL
This question actually doesn't have anything to do with SQL*Plus; it's strictly a SQL question, and SQL questions are best posted on the "SQL and PL/SQL" forum:
PL/SQL
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I am here 1
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Solved!
Go to Solution.yigit wrote:
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Thanks for the quick reply.
But to me this looks more like a OKR solution and I have already created these Factory Reset discs.
Will these discs work if I have installed a completely new hard disk in the dive? Because that is what I would need to do in the rare event that I have a complete hard disk failure.
What is confusing is the fact that on these forums, I find many messages which indicate that the OKR solution would work only with the original hard disk and it would not work with a completely new hard disk and also that the OKR itself would not be able to change partitions on the hard disk - even when it is the original hard disk. To me this means any disks that are created using the OKR would be useless when the original hard disk has undergone severe change or a completely new hard disk is in its place. Correct me if I am wrong. (In fact I am hoping that I am wrong in that assumption.)
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How to enter a data into the specified column and row in a created table
Hi,
I want to enter some data to specified column and row in a already created table. Please let me know how to do this.
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If you want to modify it manually and directly from the front panel, make it into a control and type directly into the desired element. (In this case your program would need to write to it using a local variable).
Atttached is a simple example in LabVIEW 7.0 that shows both possibilities.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ChangeTableEntries.vi 41 KB
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