如何修改该sql——在存储过程中利用循环来求和
我想要的是：在存储过程中利用循环来求0-50的和。
请问该存储过程应该如何修改？

CREATE PROCEDURE pro_Sum
@addend int
AS
BEGIN
Declare @sql nvarchar(225)
Declare @n int
Declare @Sum int
set @n=0
while @n<@addend
begin
set @sql='@sum=@Sum+@addend'
exec(@sql)
set @n=@n+1
end
END

execute pro_Sum 50;
[解决办法]
纯粹你的需求，这样就可以了：

SELECT  SUM(number)
FROM    master..spt_values
WHERE   number BETWEEN 0 AND 50
        AND type = 'p'

[解决办法]

create  PROCEDURE pro_Sum @addend INT
AS 
BEGIN
    DECLARE @sql NVARCHAR(225)
    DECLARE @n INT
    DECLARE @Sum INT
    SET @n = 0
    SET @Sum=0
    WHILE @n < @addend 
        BEGIN
            SET @Sum=@Sum+@n
            SET @n = @n + 1
        END
        
        PRINT @Sum
        PRINT @n
        SELECT  @Sum
END
go

EXEC pro_Sum 50
/*1225*/

[解决办法]
DECLARE @i int,@Sum int
set @i=1
SET @Sum=0
WHILE @i<50
BEGIN
SET @Sum=@Sum+@n
SET @i= @i + 1

END
PRINT @Sum