Use this statement to exit from a function, procedure or batch unconditionally, optionally providing a return value.
RETURN [ expression ]
A RETURN statement causes an immediate exit from a block of SQL. If expression is supplied, the value of expression is returned as the value of the function or procedure.
If the RETURN appears inside an inner BEGIN block, it is the outer BEGIN block that is terminated.
Statements following a RETURN statement are not executed.
Within a function, the expression should be of the same data type as the function's RETURNS data type.
Within a procedure, RETURN is used for Transact-SQL-compatibility, and is used to return an integer error code.
SQL/2003 Persistent Stored Module feature.
The following function returns the product of three numbers:
CREATE FUNCTION product ( a NUMERIC, b NUMERIC, c NUMERIC ) RETURNS NUMERIC BEGIN RETURN ( a * b * c ); END;
Calculate the product of three numbers:
SELECT product(2, 3, 4);
|product(2, 3, 4)|
The following procedure uses the RETURN statement to avoid executing a complex query if it is meaningless:
CREATE PROCEDURE customer_products ( in customer_ID integer DEFAULT NULL) RESULT ( ID integer, quantity_ordered integer ) BEGIN IF customer_ID NOT IN (SELECT ID FROM Customers) OR customer_ID IS NULL THEN RETURN ELSE SELECT Products.ID,sum( SalesOrderItems.Quantity ) FROM Products, SalesOrderItems, SalesOrders WHERE SalesOrders.CustomerID=customer_ID AND SalesOrders.ID=SalesOrderItems.ID AND SalesOrderItems.ProductID=Products.ID GROUP BY Products.ID END IF END;
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