Question

我有一个SQL选择了一些行，我希望它也选择行跟随我选择的每一行，我无法弄清楚如何编写这样的查询...

简单选择：

SELECT myIndex, scr, date from history where x.state = "Move to Test"

我的最新尝试：

SELECT myIndex, scr, date
from history as x cross join history as y on y.myIndex + 1 = x.myIndex
where state = "Move to Test"

这给出了：＆＃34;模糊的列名：myIndex＆＃34;

如果我要像这样指定列表;

SELECT x.myIndex, x.scr, x.date
from history as x cross join history as y on y.myIndex + 1 = x.myIndex
where x.state = "Move to Test"

我从“＆＃39; y”中选择了什么都没有。表...

以下是我的输出应该的示例：

391 200024   2006-11-27 16:03:43     Move to Test     < I am selecting this row
392 200024   2006-11-27 16:21:02     Dev              < I want to also select the *next* row, regardless of what's in it
395 200024   2006-11-29 10:58:17     Move to Test     < selected
396 200024   2006-11-29 12:10:29     Peer Review      < next
402 200024   2006-11-30 07:27:51     Move to Test     < selected
403 200024   2006-11-30 08:26:13     TQA              < next
408 200024   2007-05-03 08:35:40     Move to Test     < selected
409 200024   2007-05-03 08:52:53     Dev              < next

Answer 1

只需将or y.state = "Move to Test"添加到上一个查询中，然后将+更改为-。

Answer 2

在SQLite 3.8.3或更高版本中：

WITH indexes AS (SELECT myIndex
                 FROM history
                 WHERE state = 'Move to Test')
SELECT myIndex,
       scr,
       date
FROM history
WHERE myIndex     IN indexes
   OR myIndex - 1 IN indexes

在早期版本中，您无法使用CTE：

SELECT myIndex,
       scr,
       date
FROM history
WHERE myIndex     IN (SELECT myIndex FROM history WHERE state = 'Move to Test')
   OR myIndex - 1 IN (SELECT myIndex FROM history WHERE state = 'Move to Test')

Answer 3

如果我理解正确，您希望从两个表中myIndex，那么为什么不使用：

SELECT x.myIndex,y.myIndex x.scr, x.date
from history as x cross join history as y on y.myIndex + 1 = x.myIndex
where x.state = "Move to Test"

SQLite加入不起作用

3 个答案: