Question

I can’t get to the bottom of why my output variable in the code below is returning null. I’ve stepped through it in debug, and copy/ ran the sql statement, and it does return the expected values. But when I run it, just null. Any help would be great..

ALTER PROCEDURE [dbo].[spCountOfMostRecentByTableName] @table VARCHAR(120),
    @count BIGINT OUTPUT

AS
BEGIN

DECLARE @parameters NVARCHAR(100)
SET @parameters = '@count BIGINT OUTPUT'

DECLARE @date DATE = dbo.MostRecentTradeDateForDataDownload()

DECLARE @sql NVARCHAR(MAX) = N'

SELECT COUNT(ID)
FROM ' + @table + 
' WHERE DateAdded = ''' + CAST(@date AS CHAR) + '''';

EXEC sp_executesql @sql, @parameters, @count = @count OUTPUT
SELECT @count

END

Answer 1

You aren’t setting the @count variable anywhere.

Change

SELECT COUNT(ID)

to

SELECT @count = COUNT(ID)