MySQL 如何将来自不同列的日期和时间组合以与整个日期时间进行比较
您可以使用CONCAT()函数将来自不同MySQL列的日期和时间组合以与整个日期时间进行比较。 语法如下 –
SELECT *FROM yourTableName WHERE CONCAT(yourDateColumnName,'',yourTimeColumnName) > 'yourDateTimeValue';
Mysql
要理解上述语法,让我们创建一个表。 创建表的查询如下所示 –
mysql> CREATE TABLE DifferentDateTime
-> (
-> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> ArrivalDate date,
-> ArrivalTime time
-> );
Mysql
使用插入命令在表中插入一些记录。 查询如下所示 –
mysql> INSERT INTO DifferentDateTime(ArrivalDate,ArrivalTime) VALUES (curdate(), '10:27:30');
mysql> INSERT INTO DifferentDateTime(ArrivalDate,ArrivalTime) VALUES ('2016-04-24', '15:00:00');
mysql> INSERT INTO DifferentDateTime(ArrivalDate,ArrivalTime) VALUES ('2015-12-25', '12:30:30');
mysql> INSERT INTO DifferentDateTime(ArrivalDate,ArrivalTime) VALUES ('2012-01-31', '16:00:30');
mysql> INSERT INTO DifferentDateTime(ArrivalDate,ArrivalTime) VALUES ('2000-07-12', '09:45:31');
Mysql
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示例
使用SELECT语句显示表中的所有记录。 查询如下所示 –
mysql> SELECT *FROM DifferentDateTime;
Mysql
输出
+----+-------------+-------------+
| Id | ArrivalDate | ArrivalTime |
+----+-------------+-------------+
| 1 | 2019-02-14 | 10:27:30 |
| 2 | 2016-04-24 | 15:00:00 |
| 3 | 2015-12-25 | 12:30:30 |
| 4 | 2012-01-31 | 16:00:30 |
| 5 | 2000-07-12 | 09:45:31 |
+----+-------------+-------------+
5 rows in set (0.00 sec)
Mysql
示例
这是从不同列组合日期和时间并与日期时间值进行比较的查询 –
mysql> SELECT *FROM DifferentDateTime WHERE CONCAT(ArrivalDate,'',ArrivalTime) > '2007-01-31 12:30:30';
Mysql
输出
+----+-------------+-------------+
| Id | ArrivalDate | ArrivalTime |
+----+-------------+-------------+
| 1 | 2019-02-14 | 10:27:30 |
| 2 | 2016-04-24 | 15:00:00 |
| 3 | 2015-12-25 | 12:30:30 |
| 4 | 2012-01-31 | 16:00:30 |
+----+-------------+-------------+
4 rows in set (0.00 sec)
Mysql