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 Strange union query failure		  New Topic  Reply to Topic
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GustiX
Starting Member

Iceland
26 Posts
Posted - 07/14/2012 :  20:13:52  Show Profile  Reply with Quote
Hi

I have a stored procedure that has a cursor with a union query statement, something like:

declare DEMO cursor for
select col1 from table1
union
select col2 from table2
fetch next ... and so on

It appears that sometimes when the procedure is run
I only get half of the expected records (only from table2)
Is it possible if there is a deadlock (or something blocking
the select statement from table1) that a union query would only
give the results from the bottom half of a union query?

I would think that if something is blocking the top half
of the union query that it would just fail... ???

visakh16
Very Important crosS Applying yaK Herder

India
47099 Posts
Posted - 07/14/2012 :  22:51:27  Show Profile  Reply with Quote
hmm...not something i've seen so far. try this variant and see if you can reproduce same error

declare DEMO cursor for
select col
from
(
select col1 as col from table1
union
select col2 from table2
)t
fetch next ...


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
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