SQL Server 实现数字辅助表实例代码

IF OBJECT_ID(N'dbo.Nums', 'U') IS NOT NULL
BEGIN
  DROP TABLE dbo.Nums;
END
GO
 
CREATE TABLE dbo.Nums 
(
  Num INT NOT NULL,
  CONSTRAINT PK_U_CL_Nums_Num PRIMARY KEY CLUSTERED
  (
    Num ASC
  ) 
);
GO
 
INSERT INTO dbo.Nums (Num)
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS RowNum
FROM master.dbo.spt_values;
GO

1 SELECT Num
2 FROM dbo.Nums;
3 GO

IF OBJECT_ID(N'dbo.ufn_GetNums', N'IF') IS NOT NULL
BEGIN
  DROP TABLE dbo.ufn_GetNums;
END
GO
 
--==================================
-- 功能: 获取指定范围的数字数列
-- 说明: 交叉最后层级的CTE得到的数据行：在L级（从0开始计数）得到的行的总数为2^2^L。
--    例如：在5级就会得到4 294 967 596行。5级的CTE提供了超过40亿的行。
-- 作者: XXX
-- 创建: yyyy-MM-dd
-- 修改: yyyy-MM-dd XXX 修改内容描述
--==================================
CREATE FUNCTION dbo.ufn_GetNums
(
  @bintLow BIGINT,
  @bintHigh BIGINT
) RETURNS TABLE
AS
RETURN 
  WITH
    L0 AS (SELECT c FROM (VALUES(1), (1)) AS LO(c)),
    L1 AS (SELECT 1 AS c FROM L0 AS T CROSS JOIN L0 AS T2),
    L2 AS (SELECT 1 AS c FROM L1 AS T CROSS JOIN L1 AS T2),
    L3 AS (SELECT 1 AS c FROM L2 AS T CROSS JOIN L2 AS T2),
    L4 AS (SELECT 1 AS c FROM L3 AS T CROSS JOIN L3 AS T2),
    L5 AS (SELECT 1 AS c FROM L4 AS T CROSS JOIN L4 AS T2),
    Nums AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS RowNum FROM L5)
 
  SELECT TOP (@bintHigh - @bintLow + 1) @bintLow + RowNum - 1 AS Num
  FROM Nums
  ORDER BY RowNum ASC;
GO

IF OBJECT_ID(N'dbo.ufn_GetNums2', N'IF') IS NOT NULL
BEGIN
  DROP TABLE dbo.ufn_GetNums2;
END
GO
 
--==================================
-- 功能: 获取指定范围的数字数列
-- 说明: 交叉最后层级的CTE得到的数据行：在L级（从0开始计数）得到的行的总数为2^2^L。
--    例如：在5级就会得到4 294 967 596行。5级的CTE提供了超过40亿的行。 
-- 作者: XXX
-- 创建: yyyy-MM-dd
-- 修改: yyyy-MM-dd XXX 修改内容描述
--==================================
CREATE FUNCTION dbo.ufn_GetNums2
(
  @bintLow BIGINT,
  @bintHigh BIGINT
) RETURNS TABLE
AS
RETURN 
  WITH
    L0 AS (SELECT c FROM (VALUES(1), (1)) AS LO(c)),
    L1 AS (SELECT 1 AS c FROM L0 AS T CROSS JOIN L0 AS T2),
    L2 AS (SELECT 1 AS c FROM L1 AS T CROSS JOIN L1 AS T2),
    L3 AS (SELECT 1 AS c FROM L2 AS T CROSS JOIN L2 AS T2),
    L4 AS (SELECT 1 AS c FROM L3 AS T CROSS JOIN L3 AS T2),
    L5 AS (SELECT 1 AS c FROM L4 AS T CROSS JOIN L4 AS T2),
    Nums AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS RowNum FROM L5)
 
  SELECT @bintLow + RowNum - 1 AS Num
  FROM Nums
  ORDER BY RowNum ASC
  OFFSET 0 ROWS FETCH FIRST @bintHigh - @bintLow + 1 ROWS ONLY;
GO

SELECT Num
FROM dbo.ufn_GetNums(11, 20);
GO