SQL - using a variable for an IN clause

Question

I wish to do something like the following:

declare @FrameNumber nvarchar(20)
set @FrameNumber = \'(p1, p2)\'

select from myTable where c1 in @FrameNumber
         


        

Answer 1

You could put load those values into a table variable, or you could use dynamic sql. Here are examples of each:

TABLE VARIABLE

DECLARE @FrameNumbers TABLE (
    Frame NVARCHAR(20)
)

INSERT INTO @FrameNumbers (
    Frame
)
SELECT 'p1'
UNION ALL SELECT 'p2'

option 1:

SELECT * FROM myTable WHERE c1 in (
    SELECT Frame
    FROM @FrameNumbers
)

option 2:

SELECT
    m.*
FROM myTable m
INNER JOIN @FrameNumbers f ON f.Frame = m.c1

All that is fine, but this is my favorite:

DYNAMIC SQL

DECLARE 
@FrameNumber nvarchar(20),
@sql nvarchar(max),
@ParamDef nvarchar(1000)

SET @FrameNumber = '(p1, p2)'

SET @sql = N'SELECT FROM myTable WHERE c1 IN ' + @FrameNumber

EXECUTE dbo.sp_ExecuteSQL @sql