mysql - 用 min max 分组，但我可以这样做吗？

Question

我创建了一个很好的查询（感谢 stackoverflow 上的所有提示）。表结构和数据：

CREATE TABLE IF NOT EXISTS `transactions` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `actid` int(11) NOT NULL,
  `memberid` int(11) NOT NULL,
  `description` varchar(30) NOT NULL,
  `amount` decimal(10,2) NOT NULL,
  `date` datetime NOT NULL,
  `type` varchar(3) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=38 ;

数据：

INSERT INTO `transactions` (`id`, `actid`, `memberid`, `description`,
 `amount`, `date`, `type`) VALUES
(1, 601, 1, '', '4.00', '2008-10-31 00:00:00', 'REG'),
(2, 603, 1, '', '5.00', '2010-10-26 00:00:00', 'REG'),
(3, 604, 1, '', '8.00', '2011-10-21 00:00:00', 'REG'),
(4, 1040, 1, '3/5', '2.00', '2009-02-18 00:00:00', 'REG'),
(5, 1042, 1, '8/19', '2.00', '2010-08-19 00:00:00', 'REG'),
(6, 1243, 1, '', '3.00', '2008-01-23 00:00:00', 'REG'),
(7, 1301, 1, '', '1.00', '2000-10-11 00:00:00', 'REG'),
(8, 1306, 1, '', '1.00', '1996-05-17 00:00:00', 'REG'),
(9, 1379, 1, '', '2.00', '2007-11-01 00:00:00', 'REG'),
(10, 1380, 1, '', '2.00', '2008-12-09 00:00:00', 'REG'),
(11, 1381, 1, '', '2.00', '2009-10-20 00:00:00', 'REG'),
(12, 1382, 1, '', '2.00', '2010-10-21 00:00:00', 'REG'),
(13, 1383, 1, '', '2.00', '2011-10-20 00:00:00', 'REG'),
(14, 1384, 1, 'tkt #56', '2.00', '2012-10-12 00:00:00', 'REG'),
(15, 1396, 1, '', '2.00', '2006-10-12 00:00:00', 'REG'),
(16, 1491, 1, '', '20.00', '2007-01-03 00:00:00', 'REG'),
(17, 1494, 1, '', '40.00', '2006-01-09 00:00:00', 'REG'),
(18, 1498, 1, 'GUEST', '32.00', '2004-01-29 00:00:00', 'REG'),
(19, 601, 1, 'cash', '4.00', '2007-11-01 00:00:00', 'CHK'),
(20, 603, 1, 'cash', '5.00', '2009-10-26 00:00:00', 'CHK'),
(21, 604, 1, 'cash', '8.00', '2010-10-21 00:00:00', 'CHK'),
(22, 1040, 1, '2/19', '2.00', '2009-02-18 00:00:00', 'CHK'),
(23, 1040, 1, 'cash 3/5', '2.00', '2009-03-05 00:00:00', 'CHK'),
(24, 1042, 1, 'cash', '2.00', '2010-08-19 00:00:00', 'CHK'),
(25, 1243, 1, 'cash', '3.00', '2008-01-23 00:00:00', 'CHK'),
(26, 1301, 1, 'cash', '1.00', '2000-10-11 00:00:00', 'CHK'),
(27, 1306, 1, 'CASH', '1.00', '1996-05-17 00:00:00', 'CHK'),
(28, 1379, 1, 'cash', '2.00', '2007-11-01 00:00:00', 'CHK'),
(29, 1380, 1, 'cash', '2.00', '2008-12-09 00:00:00', 'CHK'),
(30, 1381, 1, 'cash', '2.00', '2009-10-20 00:00:00', 'CHK'),
(31, 1382, 1, 'cash', '2.00', '2010-10-21 00:00:00', 'CHK'),
(32, 1383, 1, 'cash', '2.00', '2011-10-20 00:00:00', 'CHK'),
(33, 1384, 1, 'cash tkt# 56', '2.00', '2012-10-12 00:00:00', 'CHK'),
(34, 1396, 1, '325', '2.00', '2006-10-12 00:00:00', 'CHK'),
(35, 1491, 1, '', '20.00', '2007-01-03 00:00:00', 'CHK'),
(36, 1494, 1, '252', '40.00', '2006-01-09 00:00:00', 'CHK'),
(37, 1498, 1, '9223-143', '32.00', '2004-01-29 00:00:00', 'CHK');

询问：

SELECT actid, SUM( IF( TYPE =  'REG', amount, 0 ) ) AS  `charge`, 
SUM( IF( TYPE =  'CHK', amount, 0 ) ) AS  `payment`, 
min(date) as firstdate, max(date) as lastdate
FROM transactions
WHERE memberid =1
GROUP BY actid
ORDER BY firstdate 

结果：

actid   charge  payment firstdate           lastdate
1306    1.00    1.00    1996-05-17 00:00:00 1996-05-17 00:00:00
1301    1.00    1.00    2000-10-11 00:00:00 2000-10-11 00:00:00
1498    32.00   32.00   2004-01-29 00:00:00 2004-01-29 00:00:00
1494    40.00   40.00   2006-01-09 00:00:00 2006-01-09 00:00:00
1396    2.00    2.00    2006-10-12 00:00:00 2006-10-12 00:00:00
1491    20.00   20.00   2007-01-03 00:00:00 2007-01-03 00:00:00
601     4.00    4.00    2007-11-01 00:00:00 2008-10-31 00:00:00
1379    2.00    2.00    2007-11-01 00:00:00 2007-11-01 00:00:00
1243    3.00    3.00    2008-01-23 00:00:00 2008-01-23 00:00:00
1380    2.00    2.00    2008-12-09 00:00:00 2008-12-09 00:00:00
1040    2.00    4.00    2009-02-18 00:00:00 2009-03-05 00:00:00
1381    2.00    2.00    2009-10-20 00:00:00 2009-10-20 00:00:00
603     5.00    5.00    2009-10-26 00:00:00 2010-10-26 00:00:00
1042    2.00    2.00    2010-08-19 00:00:00 2010-08-19 00:00:00
1382    2.00    2.00    2010-10-21 00:00:00 2010-10-21 00:00:00
604     8.00    8.00    2010-10-21 00:00:00 2011-10-21 00:00:00
1383    2.00    2.00    2011-10-20 00:00:00 2011-10-20 00:00:00
1384    2.00    2.00    2012-10-12 00:00:00 2012-10-12 00:00:00

这很好用，但是我想在查询中添加 REG 类型事务的描述，但我似乎无法让它工作。

Answer 1

我认为你需要添加你的descriptioninto select，然后添加description到 group by 子句

SELECT actid, description, SUM( IF( TYPE = 'REG', amount, 0 ) ) AS charge, SUM( IF( TYPE = 'CHK', amount, 0 ) ) AS payment, min(date) as firstdate, max(date) as lastdate 
FROM transactions 
WHERE memberid =1 
GROUP BY actid, description 
ORDER BY firstdate 

Answer 2

   SELECT actid, 
          SUM( IF( TYPE = 'REG', amount, 0 ) ) AS charge, 
          SUM( IF( TYPE = 'CHK', amount, 0 ) ) AS payment, 
          min(date) as firstdate, 
          max(date) as lastdate,
          description 
   FROM transactions 
   WHERE memberid =1 
   GROUP BY actid,description ORDER BY firstdate

Answer 3

我不知道为什么你不能在查询中添加描述但是它可以毫无困难地完成。

 SELECT actid ,  SUM( IF( TYPE =  'REG', amount, 0 ) ) AS  `charge`, 
 SUM( IF( TYPE =  'CHK', amount, 0 ) ) AS  `payment`, 
 min(date) as firstdate, max(date) as lastdate , `description`
 FROM transactions
 WHERE memberid =1
 GROUP BY actid
 ORDER BY firstdate 

演示