How Can I Assign SQL Query Results to Variables?

Assigning Query Results to SQL Variables

Assigning the result of an exec call to a variable in SQL is not possible using the provided syntax. However, there are alternative approaches for retrieving data from stored procedures or executing queries.

Output Parameters

If you need to retrieve a single value from a stored procedure, you can use an output parameter. An output parameter is a variable that is passed to a stored procedure and modified within the procedure. The modified value is then returned to the calling code.

Example:

Consider the following stored procedure that takes two parameters and assigns a DATE value to an output parameter:

CREATE PROCEDURE up_GetBusinessDay 
(
    @Date Date,
    @Offset Int,
    @NextBusinessDay Date OUTPUT
)
AS
BEGIN
    -- Code to calculate the NextBusinessDay 
    SET @NextBusinessDay = '2023-03-15'
END
GO

You can call this stored procedure from your code and specify an output parameter variable:

DECLARE @NextBusinessDay DATE;

EXEC up_GetBusinessDay @Date = '2023-03-08', @Offset = -1, @NextBusinessDay OUTPUT;

SELECT @NextBusinessDay;

This will return the DATE value calculated in the stored procedure to the @NextBusinessDay variable.

Return Values

Another option is to use a return value to indicate the success or failure of a stored procedure or query. The return value is a single integer value that is returned to the calling code.

Example:

The following stored procedure returns a return value of 1 if the input value is greater than 5, otherwise it returns 0:

CREATE PROCEDURE YourProcedure 
(
    @Param Int
)
AS
BEGIN
    IF @Param > 5
        RETURN 1;
    ELSE
        RETURN 0;
END
GO

You can handle the return value in your code using error handling mechanisms.

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