您需要将csv值转换为表的行，以使其在IN子句中工作。

以下是一个示例

You need to convert the csv value into rows of a table for it to work inside the IN clause.
Here is a sample

DECLARE @Customer TABLE
(
    CustomerId VARCHAR(100),
    CustomerName VARCHAR(100)
)

INSERT INTO @Customer
SELECT 1, 'Bob' UNION ALL
SELECT 2, 'Steve' UNION ALL
SELECT 3, 'Smith' UNION ALL
SELECT 4, 'Matt' UNION ALL
SELECT 5, 'John'


SELECT * FROM @Customer


DECLARE @CustomerId VARCHAR(100)
SET @CustomerID = N'1,3,4'

SELECT * FROM @Customer WHERE CustomerId IN (@CustomerID) --This won't work

SELECT * FROM @Customer WHERE CustomerId IN (SELECT VarcharValue FROM  dbo.ufn_CsvToVarchar(@CustomerID)) --This will work

这是用于将csv值转换为行的函数。

This is the function used to convert csv values into rows.

CREATE Function dbo.ufn_CsvToVarchar ( @Array varchar(MAX))
returns @VarcharTable table
 (VarcharValue varchar(50))
AS
begin

 declare @separator char(1)
 set @separator = ','

 declare @separator_position int
 declare @array_value varchar(1000)

 set @array = @array + ','

 while patindex('%,%' , @array) <> 0
 begin

   select @separator_position =  patindex('%,%' , @array)
   select @array_value = left(@array, @separator_position - 1)

  Insert @VarcharTable
  Values (Cast(@array_value as varchar(50)))

   select @array = stuff(@array, 1, @separator_position, '')
 end

 return
end

希望这会有所帮助。

Hope this helps.

use databasename
create procedure procedurename
(
@CustomerId int 
)
as
begin

SELECT * FROM Customer WHERE CustomerId=@CustomerId

end

尝试此程序

try this procedure