SQL 用整数创建 table

Question

我想在数据库中有一个 table 单列和整数 (1,2,...) 因为它对某些连接很有帮助。

我想出了一个使用循环的解决方案。有没有更有效的方法来创建这样的 table?

我的解决方案

CREATE TABLE #NUM
(
  NUM int
)

DECLARE @i int=1
WHILE @i<10000
BEGIN
  INSERT INTO #Temp
  SELECT @i 
  SET @i = @i + 1
END

Answer 1

我会用计数来做到这一点table

    ;WITH e1(n) AS
(
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
), -- 10
e2(n) AS (SELECT 1 FROM e1 CROSS JOIN e1 AS b), -- 10*10
e3(n) AS (SELECT 1 FROM e2 CROSS JOIN e2 AS b) -- 100*100
INSERT INTO #Temp
SELECT  ROW_NUMBER() OVER (ORDER BY n) FROM e3 ORDER BY n;

查看here了解更多信息

Answer 2

这个原理和NoDisplayName的回答是一样的，但是我觉得更干净一些（我的意见）：

;WITH TBL(ROW_NUM) AS (
    SELECT 1 AS ROW_NUM
    UNION ALL
    SELECT ROW_NUM+1
    FROM TBL
    WHERE ROW_NUM < 100
)

SELECT ROW_NUMBER() OVER (ORDER BY T1.ROW_NUM) AS ROW_NUM
FROM TBL T1
JOIN TBL T2 ON 1=1
JOIN TBL T3 ON 1=1

Answer 3

SELECT 
row_number() over (order by message_id) num
into #Table
from sys.messages

SQL 用整数创建 table

SQL create table with integers

sql

tsql

sql-server

while-loop