如何找到系列的总和？

Question

输入@n INT = 5

应该产生系列作为1,2,3,4,5

预期结果：应显示总和1 + 2 + 3 + 4 + 5 = 15

总和= 15

我怎么可以这样使用SQL Server

Answer 1

DECLARE @n INT = 5; 

WITH num(i) AS 
(
    SELECT 1 AS i 
    UNION ALL 
    SELECT i+1 AS i FROM num WHERE i <= @n - 1 
) 
SELECT SUM(i) FROM num 

Answer 2

declare @n int = 5; 
declare @sum int; 

set @sum = @n * (@n + 1)/2; 
select @sum 

Answer 3

Declare @n int = 5 
Declare @o int=0 
while @n>=1 
begin 
set @o=@o+@n 
set @n=@n-1 
End 

select @o 

Answer 4

试试这个吧！

declare @n int 
set @n=5 
declare @sum1 int 
set @sum1=0 
declare @i int 
set @i=0 
print 'the Series is' 
while @i<@n 
begin 
print @i+1 
set @i=@i+1 
set @sum1=@sum1+@i 
end 
print 'the sum is' 
print @sum1 

Answer 5

如果你只是想总结，然后用公式试试这个代码

declare @n int 
    set @n= 5; 
    declare @sum int; 

    set @sum = @n * (@n + 1)/2; 
    select @sum