mysql添加datetime字段_添加DATE和TIME字段以在MySQL中获取DATETIME字段？

作者：Cpp五条 | 2024-03-17 03:35:18

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mysql在某字段的后面增加一个时间字段,字段名为“dtime”

您可以使用CONCAT()函数设置日期和时间字段以获取DATETIME字段。

让我们创建一个演示表mysql> create table getDateTimeFieldsDemo

-> (

-> ShippingDate date,

-> ShippingTime time,

-> Shippingdatetime datetime

-> );

使用insert命令在表中插入一些记录。查询如下-mysql> insert into getDateTimeFieldsDemo(ShippingDate,ShippingTime) values('2018-01-21','09:45:34');

mysql> insert into getDateTimeFieldsDemo(ShippingDate,ShippingTime) values('2013-07-26','13:21:20');

mysql> insert into getDateTimeFieldsDemo(ShippingDate,ShippingTime) values('2017-12-31','15:31:40');

mysql> insert into getDateTimeFieldsDemo(ShippingDate,ShippingTime) values('2019-03-07','12:13:34');

使用select语句显示表中的所有记录。查询如下-mysql> select *from getDateTimeFieldsDemo;

以下是输出+--------------+--------------+------------------+

| ShippingDate | ShippingTime | Shippingdatetime |

+--------------+--------------+------------------+

| 2018-01-21 | 09:45:34 | NULL |

| 2013-07-26 | 13:21:20 | NULL |

| 2017-12-31 | 15:31:40 | NULL |

| 2019-03-07 | 12:13:34 | NULL |

+--------------+--------------+------------------+

4 rows in set (0.00 sec)

这是添加DATE和TIME字段以在MySQL中获取DATETIME字段的查询mysql> update getDateTimeFieldsDemo set Shippingdatetime=concat(ShippingDate," ",ShippingTime);

Rows matched: 4 Changed: 4 Warnings: 0

现在再次检查表记录。查询如下-mysql> select *from getDateTimeFieldsDemo;

以下是输出+--------------+--------------+---------------------+

| ShippingDate | ShippingTime | Shippingdatetime |

+--------------+--------------+---------------------+

| 2018-01-21 | 09:45:34 | 2018-01-21 09:45:34 |

| 2013-07-26 | 13:21:20 | 2013-07-26 13:21:20 |

| 2017-12-31 | 15:31:40 | 2017-12-31 15:31:40 |

| 2019-03-07 | 12:13:34 | 2019-03-07 12:13:34 |

+--------------+--------------+---------------------+

4 rows in set (0.00 sec)

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