Wednesday, 21 March 2018

Table-Valued Parameters - SQL Server

Table-valued parameters are declared by using user-defined table types. You can use table-valued parameters to send multiple rows of data to a Transact-SQL statement or a routine, such as a stored procedure or function, without creating a temporary table or many parameters.


Table-valued parameters have the following restrictions:
  • SQL Server does not maintain statistics on columns of table-valued parameters.
  • Table-valued parameters must be passed as input READONLY parameters to Transact-SQL routines. You cannot perform DML operations such as UPDATE, DELETE, or INSERT on a table-valued parameter in the body of a routine.
  • You cannot use a table-valued parameter as target of a SELECT INTO or INSERT EXEC statement. A table-valued parameter can be in the FROM clause of SELECT INTO or in the INSERT EXEC string or stored procedure. Table-valued parameters perform well for inserting less than 1000 rows.


The following example uses Transact-SQL and shows you how to create a table-valued parameter type, declare a variable to reference it, fill the parameter list, and then pass the values to a stored procedure.

USE AdventureWorks2012;  

/* Create a table type. */  
CREATE TYPE LocationTableType AS TABLE   
( LocationName VARCHAR(50)  
, CostRate INT );  

/* Create a procedure to receive data for the table-valued parameter. */  
CREATE PROCEDURE dbo. usp_InsertProductionLocation  
    @TVP LocationTableType READONLY  
    INSERT INTO AdventureWorks2012.Production.Location  
        SELECT *, 0, GETDATE()  
        FROM  @TVP;  

/* Declare a variable that references the type. */  
DECLARE @LocationTVP AS LocationTableType;  

/* Add data to the table variable. */  
INSERT INTO @LocationTVP (LocationName, CostRate)  
    SELECT Name, 0.00  
    FROM AdventureWorks2012.Person.StateProvince;  

/* Pass the table variable data to a stored procedure. */  
EXEC usp_InsertProductionLocation @LocationTVP;  


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