Question

我有一个名为orders的表，其中包含（a.o.）列sid和q1_requested_by。 sid列包含唯一的ID号，每个新输入都会递增。

有时会在q1_requested_by列中输入值ORDERS PROCESSED。

我想从表格中选择介于最新ÒRDERS PROCESSED输入和最新但只有ORDERS PROCESSED输入之间的所有内容。

我尝试过以下操作，但不起作用。它什么都不选。

SELECT * FROM orders 
WHERE sid < (SELECT max(sid) FROM orders
             WHERE q1_requested_by = 'ORDERS PROCESSED')
  AND sid > (SELECT TOP 2 sid FROM orders
             WHERE q1_requested_by = 'ORDERS PROCESSED'
             ORDER BY sid DESC)
ORDER BY sid DESC

我怎么解决这个问题？

Answer 1

您好，您可以添加限制到查询的第二部分。请试试这个：

SELECT * FROM orders 
WHERE sid < (SELECT max(sid) FROM orders WHERE q1_requested_by = 'ORDERS PROCESSED')
AND sid > (SELECT TOP 2 sid FROM orders 
WHERE q1_requested_by = 'ORDERS PROCESSED' ORDER BY sid DESC LIMIT 1) 
ORDER BY sid DESC

Answer 2

首先，您将使用MySQL构造：

SELECT o.*
FROM orders o
WHERE o.sid < (SELECT max(sid)
               FROM orders
               WHERE q1_requested_by = 'ORDERS PROCESSED'
              ) AND
      o.sid > (SELECT sid
               FROM orders
               WHERE q1_requested_by = 'ORDERS PROCESSED'
               ORDER BY sid DESC
               LIMIT 1, 1
              )
ORDER BY o.sid DESC

Answer 3

它会起作用：）

SELECT * FROM orders 
WHERE sid = (SELECT max(sid) FROM orders WHERE sid <>     
            (SELECT max(sid) FROM orders WHERE q1_requested_by = 'ORDERS PROCESSED'))

SELECT *在MAX和第二个MAX id之间的列WHERE另一列等于某个输入

3 个答案: