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Jack Vamvas's Blog

SQL Table variables do not support indexes MYTH

May 5 2011 6:15AM by Jack Vamvas   

False. Let’s look at the definition of a table variable:

DECLARE @myTableVar TABLE

(companyID INT NOT NULL,

companySize INT NOT NULL)

The constraints allowed on table variables are: PRIMARY KEY,UNIQUE KEY and NULL.

A PRIMARY KEY constraint can only be defined if certain criteria are met: No duplicate values

A UNIQUE KEY Creates a unique index on a table or view. A unique index is one in which no two rows are permitted to have the same index key value

To create a PRIMARY KEY constraint:

DECLARE @myTableVar TABLE

(companyID INT PRIMARY KEY,

companyName INT NOT NULL)

Republished from http://www.sqlserver-dba.com.


Republished from SQL Server DBA [65 clicks].  Read the original version here [32134 clicks].

Jack Vamvas
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