Select certain column only if condition met

I want to have a select that will not have fixed number of columns. Column OptionalColumn should be selected only if variable @check = 1

This is what I had (syntax is bad but maybe it explains my problem)

SELECT 
    Column1, Column2,
    (IF @Check = 1
       BEGIN OptionalColumn END)
FROM table

It is crucial to have it only if @Check = 1 and not having it if @Check = 0. Is it doable?

Answer

You could do this with an IF ELSE block like this;

CREATE TABLE #table (Column1 varchar(10), Column2 varchar(10))
INSERT INTO #table
VALUES
('column1', 'column2')

DECLARE @Check bit; SET @Check = 0

IF @Check = 1 
(SELECT Column1, Column2
FROM #table)

ELSE

(SELECT Column1
FROM #table)

Change the variable from 0 to 1 for testing to see the change in number of columns.