Define variable to use with IN operator (T-SQL)

Question

I have a Transact-SQL query that uses the IN operator. Something like this:

select * from myTable where myColumn in (1,2,3,4)

Is there a wa

Answer 1

As no one mentioned it before, starting from Sql Server 2016 you can also use json arrays and OPENJSON (Transact-SQL):

declare @filter nvarchar(max) = '[1,2]'

select *
from dbo.Test as t
where
    exists (select * from openjson(@filter) as tt where tt.[value] = t.id)

You can test it in sql fiddle demo

You can also cover more complicated cases with json easier - see Search list of values and range in SQL using WHERE IN clause with SQL variable?