I want to check in SQL whether a given value exists in one of my tables inside a stored procedure. This is the method I used:
IF( (SELECT COUNT([ID]) FROM my_Table WHERE [Col] = @SP_Parameter) > 0)
BEGIN
--My Code
END
But that statement is never true no matter what. I made sure the row exists, but it never runs as true.
If your code doesn't work, then nothing matches the WHERE clause. Or, you are misinterpreting the results.
This answer will not fix that problem. But the better way to write the condition is:
IF (EXISTS (SELECT 1 FROM my_Table WHERE [Col] = @SP_Parameter) )
BEGIN
--My Code
END;
This is less expensive than doing an aggregation query because it can stop at the first matching row.
COUNT([ID]) thus ignoring NULLs in [ID] (unless that column is declared NUT NULL, which doesn't seem unlikely but we don't know). So it might be necessary to extend the WHERE clause with a AND [ID] IS NOT NULL.
You can use EXISTS () in SQL. try this query
IF EXISTS( SELECT top 1 [ID] FROM my_Table WHERE [Col] = @SP_Parameter )
BEGIN
--My Code
END
IF EXISTS (SELECT 1 FROM dbo.EmployeeAllowedStatuses WHERE EmployeeAllowedStatuses_ID=EmployeeAllowedStatuses_ID)
BEGIN
SELECT 'RECORD ALREADY EXISTS' as Result
END
ELSE
BEGIN
SELECT 'RECORD NOT EXISTS' as Result
END
IF NOT EXISTS (SELECT 1 FROM dbo.EmployeeAllowedStatuses WHERE EmployeeAllowedStatuses_ID=EmployeeAllowedStatuses_ID)
BEGIN
SELECT 'RECORD NOT EXISTS' as Result
END
ELSE
BEGIN
SELECT 'RECORD ALREADY EXISTS' as Result
END
IFstatementIFstatement. Microsoft's SQL Server uses T-SQL which does indeed haveIFstatement - but that is not part of "SQL" (the standardized query language)