How to do comma-separated string to make IN List of strings in the Where clause in sql server ?

CREATE function [dbo].[CommaSeperated_split]
@param nvarchar(max), 
@delimiter char(1)
returns @table table (val nvarchar(max), seq int)
set @param += @delimiter
;with a as
select cast(1 as bigint) f, charindex(@delimiter, @param) t, 1 seq
union all
select t + 1, charindex(@delimiter, @param, t + 1), seq + 1
from a
where charindex(@delimiter, @param, t + 1) > 0
insert @table
select substring(@param, f, t - f), seq from a
option (maxrecursion 0)

--Use like this below

FROM yourtable 
WHERE account in (SELECT val FROM dbo.CommaSeperated_split(@account, ','))

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