Question

我的查询在MYSQL中工作，但在MYSQLI中没有。

我正在选择完成前后测试的学生。

 SELECT 
  studid as Username, 
  prepoints as 'Fitness Assessment Points Grade', 
  end AS 'End-of-Line Indicator' 
 FROM 
  fittest, points 
 WHERE
  YEAR(submitted) = '2017' 
  AND semester = 'summer2' 
 GROUP BY studid
 HAVING 
  (MAX(prepost = 'pre' ) + MAX(prepost = 'post')) = 2 AND COUNT(DISTINCT prepost) = 2

任何想法需要做些什么改变才能让它再次运作？

以下是一些示例数据：

 CREATE TABLE `fittest` (   `id` int(11) NOT NULL,   `submitted`
 datetime DEFAULT NULL,   `studid` varchar(100) DEFAULT NULL,  
 `semester` varchar(50) DEFAULT NULL,   `instructor` varchar(30)
 DEFAULT NULL,   `course` enum('PHED 1164') DEFAULT NULL,   `section`
 enum('5001','5003','5005','5007','5009','5011','5013','5015','5017','5019','5021','5023','5025','5027','5029','5031','5033','5035','5037','5039','5041','5043','5045','5047','5049','5051','5053','5055','5057','5059','5061','5063','5065','5067','5069')
 DEFAULT NULL,   `age` varchar(50) DEFAULT NULL,   `gender`
 enum('m','f') DEFAULT NULL,   `ethnicity` enum('Hispanic','African
 American','Asian','White-Non Hispanic','Other') DEFAULT NULL,  
 `height` char(4) DEFAULT NULL,   `weight` int(3) DEFAULT NULL,  
 `flexibility` int(2) DEFAULT NULL,   `crunches` int(3) DEFAULT NULL,  
 `pushups` int(3) DEFAULT NULL,   `treadtimemin` int(2) DEFAULT NULL,  
 `treadtimesec` int(2) NOT NULL,   `treadhr` int(3) DEFAULT NULL,  
 `prepost` enum('pre','post') NOT NULL,   `end` char(1) NOT NULL
 DEFAULT '#' ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

 INSERT INTO `fittest` (`id`, `submitted`, `studid`, `semester`,
 `instructor`, `course`, `section`, `age`, `gender`, `ethnicity`,
 `height`, `weight`, `flexibility`, `crunches`, `pushups`,
 `treadtimemin`, `treadtimesec`, `treadhr`, `prepost`, `end`) VALUES
 (17, '2017-01-02 21:55:33', 'slacker', 'spring', 'Tim', 'PHED 1164',
 '5001', '32', 'm', NULL, '69.5', 155, NULL, 29, 34, 22, 15, 76, 'pre',
 '#'), (16, '2017-01-02 21:31:34', 'bfun', 'spring', 'Tim', 'PHED
 1164', '5001', '32', 'm', NULL, '69.5', 122, NULL, 37, 36, 18, 14, 76,
 'post', '#'), (15, '2017-01-02 21:31:09', 'bfun', 'spring', 'Tim',
 'PHED 1164', '5001', '32', 'm', NULL, '69.5', 129, NULL, 21, 20, 23,
 14, 76, 'pre', '#'),

Answer 1

我刚刚发现问题不在于查询。这是输入。所有输入都有帖子的前置值，因此没有显示结果。谢谢你的帮助。

查询在MYSQL中工作，但不在MYSQLI中

1 个答案: