SQL SERVER函数中使用SELECT 给变量赋值

SQL SERVER函数中使用SELECT 给变量赋值，注意函数中不能用SELECT INTO

SELECT @UserId= UserId FROM Tweet WHERE Id= @ReplyTo;

实例代码如下：

CREATE FUNCTION MyFun
(

)
RETURNS int
AS
BEGIN
        DECLARE @ReplyTo int
        DECLARE @UserId int
        DECLARE My_Cursor CURSOR --定义游标
        FOR (SELECT ReplyTo FROM Tweet WHERE ReplyTo<> 0) --查出需要的集合放到游标中
        OPEN My_Cursor; --打开游标
        FETCH NEXT FROM My_Cursor INTO @ReplyTo ; --读取第一行数据
        WHILE @@FETCH_STATUS = 0
        BEGIN                     
      SELECT @UserId= UserId FROM Tweet WHERE Id= @ReplyTo;
             FETCH NEXT FROM My_Cursor INTO @ReplyTo; --读取下一行数据
        END
        CLOSE My_Cursor; --关闭游标
        DEALLOCATE My_Cursor; --释放游标

        RETURN 0

END
GO