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

)

Source:Jack Vamvas (http://www.sqlserver-dba.com)

Author: Jack Vamvas (http://www.sqlserver-dba.com)