Question

SQL SERVER避免我们在SQL函数中将paramter作为输出“通过引用传递”传递它只允许我们在程序中这样做有没有办法在函数中做到这一点？

如果没有，请任何人帮我在Select语句中分配值

就像这个例子：

Declare @X as float
set @X 
select  column1, column2,  @X = @X+ column1+column2 FROM someView

Answer 1

要产生这样的结果，您可以尝试这个解决方案：

SELECT s1.column1, s1.column2, sum(s1.column1 + s1.columns2) as res 
FROM  someView s1 cross join someView s2 
WHERE s1.[OrderColum] <= s1.[OrderColum]
GROUP BY s1.column1, s1.columns2

但如果您没有订单栏，可以尝试此解决方案

WITH someViewWithOrder AS
(
    SELECT column1,column2,ROW_NUMBER() OVER(ORDER BY (SELECT 1)) AS row_id
        FROM someView
) 
SELECT s1.column1, s1.column2, sum(s1.column1 + s1.columns2) as res
    FROM someViewWithOrder s1
        INNER JOIN someViewWithOrder s2 ON s1.row_id >= b.row_id
GROUP BY s1.column1, s1.columns2;

Answer 2

您可以像这样分配结果

Declare @X as float

select @X = sum(column1 + column2) 
FROM someView

计算运行总计this approach的作品（快速）

Answer 3

这是递归CTE的工作：

WITH CTE AS (
  SELECT
    Column1,
    Column2,
    rownum = ROW_NUMBER() OVER (ORDER BY (SELECT 1))
  FROM someView
),
RecCTE AS (
  SELECT
    Column1,
    Column2,
    Total = Column1 + Column2
  FROM CTE
  WHERE rownum = 1
  UNION ALL
  SELECT
    c.Column1,
    c.Column2,
    Total = r.Total + c.Column1 + c.Column2
  FROM CTE c
    INNER JOIN RecCTE ON c.rownum = r.rownum + 1
)
SELECT *
FROM RecCTE

我们不能用引用“输出”传递的参数创建SQL服务器函数吗？

3 个答案: