How is this query executing? - SQL Server Forums

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How is this query executing?

Author

Topic

learntsql

524 Posts

Posted - 2010-10-04 : 03:08:45

create table T1(A int)
create table T2(B int)

insert into T1 values(1)
insert into T2 values(2)

select *
from T1
where A =(SELECT A FROM T2)

drop table T1
drop table T2

TIA.

Transact Charlie
Master Smack Fu Yak Hacker

3451 Posts

Posted - 2010-10-04 : 04:25:42

~~What??? Weren't you involved in exactly this question before?~~
It wasn't you who asked.

There was a very similar post raised recently. Here's the link:
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=150951

The inner query (SELECT A FROM T2) is implicitly getting the value from T1 (because T1 is in it's scope from the outer query)

Change the query to


create table T1(A int)
create table T2(B int)

insert into T1 values(1)
insert into T2 values(2)

select *
from T1
where A =(SELECT tab2.A FROM T2 AS tab2)

drop table T1
drop table T2

And you'll get the failure you were expecting.

Charlie
===============================================================
Msg 3903, Level 16, State 1, Line 1736
The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION

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