Comments on: select distinct collect

by: Laurent Schneider

Tue, 13 May 2008 14:49:54 +0000

I have posted your question on the otn documentation forum
http://forums.oracle.com/forums/thread.jspa?threadID=655089

by: Laurent Schneider

Thu, 08 May 2008 17:47:06 +0000

sorry for wordpress issue and thanks for comment, I will have a look

by: Madhu

Thu, 08 May 2008 17:03:22 +0000

It’s not showing up once again, wish there was preview.
Last try:

collect (column)

by: Madhu

Thu, 08 May 2008 17:00:19 +0000

For some reason a line is missing in my previous posting and the format is messed too.

The sql reference spec for collect is defined as:

(the missing line)

by: Madhu

Thu, 08 May 2008 16:55:08 +0000

On a side issue, if you look at the spec for collect in sql reference, it is defined as:

So it appears , collect (distinct column) should be a syntax error , but is not. We have a code that uses:


COLLECT (col1 order by col2)

It works in general but we have run into ORA-00600 when used from a java application and have a open SR. I am not sure if we got lucky into using “order by” or if it’s a documentation bug.
Any thoughts?

thanks.

by: Laurent Schneider

Tue, 06 May 2008 17:01:41 +0000

too early

select job, collect(distinct deptno) deptnos
from emp group by job;

works

but

select collect(distinct deptno) deptnos
from emp group by job;

works

but not with distinct — !-!!

by: Chen Shapira

Tue, 06 May 2008 16:59:38 +0000

Maybe its still too early in the morning, but:

select job, collect(distinct deptno) deptnos
from emp group by job;

works.

Same query, remove one column and you get an error about order:

select distinct collect(distinct deptno) deptnos
from emp group by job;

ERROR at line 1:
ORA-22950: cannot ORDER objects without MAP or ORDER method

How does that make sense?

(BTW. I understood the question as STRAGG question, but as I said, its still early)