Question

如何从while循环创建sql server cte
像我这样的循环

  declare @ind as int
  declare @code as nvarchar
  set @ind  = 0
   while @ind < 884
  begin
    select @ind  = @ind  + 1
    --here execute Procedure 
        --and set return value to variable 
    set @code = cast (@ind   as nvarchar)
  end

Answer 1

以下查询选择0到884之间的值：

;WITH T(Num)AS
(
    SELECT 0 
    UNION ALL
    SELECT Num+1 FROM T WHERE T.Num < 884
)SELECT Num FROM T 
OPTION (MAXRECURSION 0);

Answer 2

如果您需要表格：

;WITH Sec(Number) AS 
(
    SELECT 0 AS Number
    UNION ALL
    SELECT Number + 1
    FROM Sec
    WHERE Number < 884
) 

SELECT * FROM Sec
OPTION(MAXRECURSION 0)

如果您需要一个字符串：

;WITH Sec(Number) AS 
(
    SELECT 0 AS Number
    UNION ALL
    SELECT Number + 1
    FROM Sec
    WHERE Number < 884
) 

SELECT STUFF(a.[Str], 1, 1, '')
FROM
(
    SELECT (SELECT ',' + CAST(Number AS NVARCHAR(3)) 
    FROM Sec
    FOR XML PATH(''), TYPE
    ).value('.','varchar(max)') AS [Str] 
) AS a
OPTION(MAXRECURSION 0)

用cte创建while循环

2 个答案: