MySQL select 1000个增量数字

Question

是否有可能 select 递增数字，例如：

我试过：

set @i=999;
select @i:=@i+1 as num
limit 1000

还有：

set @i=999;
select @i:=@i+1 as num
where @i <1999;

Answer 1

我假设（可能是错误的）您正在尝试 select 基于自动递增主键的行，看到这是 MySQL?

使用 "BETWEEN" 关键字比使用变量更好吗？

例如，如果您想要 select 来自 table 'myTable' 的行，并且 'num' 是主键：

SELECT num FROM myTable
WHERE num BETWEEN 999 AND 1999

Answer 2

您必须对 1000 行进行操作 table 才能得到您想要的结果：

SELECT @i := @i+1 AS num
FROM (
  SELECT 1 AS x UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
  SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 AS x UNION ALL 
  SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
) AS t
CROSS JOIN (
  SELECT 1 AS x UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
  SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 AS x UNION ALL 
  SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
) AS s
CROSS JOIN (
  SELECT 1 AS x UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
  SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 AS x UNION ALL 
  SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
) AS u
CROSS JOIN (SELECT @i := 999) AS var

在 10 x 10 x 10 table 组合上使用 CROSS JOIN，我们得到 1000 行内联 table。以此为基础，我们可以计算出所需的 @i 值序列。

Demo here

Answer 3

这里是一个简单的查询，用于打印数字 1000 - 1999 和设置的增量值。

DECLARE @firstNumber INT
DECLARE @lastNumber INT
DECLARE @incrementBy INT

SET @firstNumber = 1000
SET @lastNumber = 1999
SET @incrementBy = 1

CREATE TABLE #TEMP ( number INT) 

WHILE(@firstNumber <= @lastNumber)
BEGIN
    INSERT INTO #TEMP VALUES (@firstNumber)
    SET @firstNumber = @firstNumber + @incrementBy
END

SELECT * FROM #TEMP

DROP TABLE #TEMP

MySQL select 1000个增量数字

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