SQL存储过程给变量赋值没有数据

Question

SQL存储过程 给变量赋值 赋值内容为空 写死条件可以
代码如下：
USE [TT]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER proc [dbo].[FRPrintMX]
(
@Nos varchar(60),
@Flag int
)
as
begin
declare

    @Llr    varchar(36)  

set nocount on

SELECT @Llr=(SELECT TOP 1 UseMan FROM MatReq q,MatReqmx x WHERE q.MRno=x.MRno AND x.PzNo LIKE @Nos+',') --无数据
-- SELECT @Llr=(SELECT TOP 1 UseMan FROM MatReq q,MatReqmx x WHERE q.MRno=x.MRno AND x.PzNo LIKE '20220802040097@'+',') --有查询数据
raiserror(@Llr,16,1) -- @Llr的内容为空

Answer 1

你存储过程在哪个地方给@Nos变量赋值了呢？