Procedure 存储过程
创建存储过程：
create proc ProductList
go
as
begin
select p.productID,p.Name from Product as p
end

想进行修改，输出类型为nvarchar（max）的数据；nvarchar是productID拼接而成的
declare @provarchar nvarchar（max）

set @provarchar=productID1+","+productID2+","+productID3+","+…+productIDn

[解决办法]

SQL code

create table Product (   productID varchar(10),   name varchar(100))--测试数据insert into Product select 'product1','aaa' union allselect 'product2','bbb' union allselect 'product3','ccc' union allselect 'product4','ddd'CREATE PROC ProductList@provarchar nvarchar(max) OUTPUT   -- 要输出的参数ASBEGIN    select @provarchar=isnull(@provarchar+',' , '')+ productID  from ProductENDDECLARE @ProductList nvarchar(max)EXEC ProductList @ProductList OUTPUTselect @ProductList--结果--product1,product2,product3,product4