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Table Variables


Table Variables

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Tom Thomson
Tom Thomson
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Comments posted to this topic are about the item Table Variables

Tom

Kingston Dhasian
Kingston Dhasian
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Good QOTD.
This will clear quite a few misconceptions people have about Table Variables.


Kingston Dhasian

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paul s-306273
paul s-306273
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Strange question if you ask me...
Nils Gustav Stråbø
Nils Gustav Stråbø
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Aaaaarg!!! Got it wrong because of the unclustered index options.

I know that SQL Server enforces unique constraints by creating unique indexs, but I wasn't sure if this was what the author meant.

A minor detail; You probably mean ROGUIDCOL, not ROWGUID.
Igor Micev
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Very good question!
IgorMi

Igor Micev,
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ako58
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Microsoft SQL Server 2008 R2 (RTM) - 10.50.1600.1 (X64) Apr 2 2010 15:48:46 Copyright (c) Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.0 <X64> (Build 6002: Service Pack 2)

DECLARE @t TABLE (id INT IDENTITY,
id1 INT CHECK (id>id1))

Msg 8141, Level 16, State 0, Line 1
Column CHECK constraint for column 'id1' references another column, table '@t'.
Gazareth
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Nils Gustav Stråbø (10/19/2012)
Aaaaarg!!! Got it wrong because of the unclustered index options.

I know that SQL Server enforces unique constraints by creating unique indexs, but I wasn't sure if this was what the author meant.


Ditto. Grr. :-)

Equally, the PK can be nonclustered. But I was thinking along the lines of explicity created indexes when I answered.
Nils Gustav Stråbø
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ako58 (10/19/2012)
Microsoft SQL Server 2008 R2 (RTM) - 10.50.1600.1 (X64) Apr 2 2010 15:48:46 Copyright (c) Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.0 <X64> (Build 6002: Service Pack 2)

DECLARE @t TABLE (id INT IDENTITY,
id1 INT CHECK (id>id1))

Msg 8141, Level 16, State 0, Line 1
Column CHECK constraint for column 'id1' references another column, table '@t'.

you need to declare the check constraint separately

DECLARE @t TABLE (id INT IDENTITY,
id1 INT, CHECK (id>id1))



The error you got applies to normal and temporary tables aswell, so it is not a limitation on table variables. the following will also fail with the same error message.
create TABLE t(id INT IDENTITY,
id1 INT CHECK (id>id1))

create TABLE #t(id INT IDENTITY,
id1 INT CHECK (id>id1))


Igor Micev
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Nils Gustav Stråbø (10/19/2012)
Aaaaarg!!! Got it wrong because of the unclustered index options.

I know that SQL Server enforces unique constraints by creating unique indexs, but I wasn't sure if this was what the author meant.

A minor detail; You probably mean ROGUIDCOL, not ROWGUID.


declare @tabela table
(id int not null,
val1 varchar(20),
val2 varchar(20),
unique(val1,val2),
primary key nonclustered(id,val1)
)

Igor Micev,
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Paul White
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I found this a good and quite straightforward question (though it is SQL Server 2012 not SQL Server 2011).



Paul White
SQLPerformance.com
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