MySQL 选择 1000 个增量数字

Question

是否可以选择增量数字，例如:

num
1000
1001
1002
1003
1004
...
1999

我已经尝试过:

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

你必须对一个 1000 行的表进行操作才能得到你想要的:

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 表组合上使用 CROSS JOIN，我们得到一个 1000 行的内联表。以此为基础，我们可以计算所需的 @i 值序列。

Demo here