Question

有一个MySQL 表：

+----+-------+------+------------+---------+
| id | name  | type |    date    | deleted |
+----+-------+------+------------+---------+
| 1  | nameA |  1   | 2016:10:15 |    1    |
+----+-------+------+------------+---------+
| 2  | nameB |  1   | 2016:10:20 |    0    |
+----+-------+------+------------+---------+
| 3  | nameC |  2   | 2016:09:26 |    0    |
+----+-------+------+------------+---------+
| 4  | nameD |  2   | 2016:09:30 |    0    |
+----+-------+------+------------+---------+
| 5  | nameE |  3   | 2016:09:26 |    0    |
+----+-------+------+------------+---------+

我想SELECT除了删除= 1之外的所有内容，除非type = 2的日期早于今天（2016：09：27）。所以我尝试使用NOT IN，但我这样做也排除了type = 3，它的日期比今天早：

$currentDate = date("Y:m:d");
$sql = "SELECT * FROM table WHERE deleted != 1 AND date NOT IN       
   (SELECT date FROM table WHERE type = 2 AND date < '$currentDate') ORDER BY date";

有任何帮助吗？谢谢！

Answer 1

试试这样：

$sql = "SELECT * FROM table WHERE deleted = 0 AND NOT (type = 2 AND date < DATE(NOW())) ORDER BY date";

我认为你不需要在PHP中定义currentDate。

Answer 2

使用Str_to_date

SELECT * FROM table 
WHERE deleted != 1 
AND date NOT IN       
(SELECT date FROM table 
WHERE type = 2 AND  str_to_date(date, '%Y:%m:%d' )  < curdate()) 
ORDER BY str_to_date(date", '%Y:%m:%d')

Answer 3

您的数据库结构存在根本性错误。如果要有效地比较日期和时间，则需要使用适当的数据类型Nullable。不要使用字符串--MySQL无法告诉如何订购结果或更低或更高的结果。

将类型更改为DATETIME并形成您的查询，如：

DATETIME

如果您根本不想使用时间，请使用WHERE datetime_column < DATE_SUB(CURDATE(), INTERVAL 1 DAY)代替DATE。

Answer 4

表格结构：

CREATE TABLE `example` (
`id` int(11) DEFAULT NULL,
`name` varchar(30) DEFAULT NULL,
`type` int(11) DEFAULT NULL,
`date` date DEFAULT NULL,
`deleted` int(11) DEFAULT NULL
)

/*Data for the table `example` */

insert  into `example`(`id`,`name`,`type`,`date`,`deleted`) values (1,'nameA',1,'2016-10-15',1),(2,'nameB',1,'2016-10-20',0),(3,'nameC',2,'2016-09-26',0),(4,'nameD',2,'2016-09-30',0),(5,'nameE',3,'2016-09-28',0),(6,'nameE',3,'2016-09-26',0);

必填查询：

SELECT * FROM EXAMPLE WHERE (deleted != 1 AND id NOT IN (SELECT id FROM EXAMPLE WHERE (TYPE = 2 AND  DATE < CURDATE()))) ORDER BY DATE

排除比今天更早的MySQL行

4 个答案: