在 MySQL 中将不同列中的日期和时间连接成一列
为此,使用 CONCAT() 函数连接日期和时间。让我们先创建一个表 -
mysql> create table DemoTable -> ( -> ShippingDate date, -> ShippingTime time, -> ShippingDatetime datetime -> ); Query OK, 0 rows affected (0.50 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable(ShippingDate,ShippingTime) values('2019-01-10', '10:40:20'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(ShippingDate,ShippingTime) values('2019-06-14', '04:00:10'); Query OK, 1 row affected (0.14 sec)
使用 select 语句显示表中的所有记录 -
mysql> select *from DemoTable;
输出
+--------------+--------------+------------------+ | ShippingDate | ShippingTime | ShippingDatetime | +--------------+--------------+------------------+ | 2019-01-10 | 10:40:20 | NULL | | 2019-06-14 | 04:00:10 | NULL | +--------------+--------------+------------------+ 2 rows in set (0.00 sec)
以下是将不同列中的日期和时间连接成 MySQL 中一列的查询 -
mysql> update DemoTable set ShippingDatetime=concat(ShippingDate,' ',ShippingTime); Query OK, 2 rows affected (0.11 sec) Rows matched: 2 Changed: 2 Warnings: 0
让我们再次检查表记录 -
mysql> select *from DemoTable;
输出
+--------------+--------------+---------------------+ | ShippingDate | ShippingTime | ShippingDatetime | +--------------+--------------+---------------------+ | 2019-01-10 | 10:40:20 | 2019-01-10 10:40:20 | | 2019-06-14 | 04:00:10 | 2019-06-14 04:00:10 | +--------------+--------------+---------------------+ 2 rows in set (0.00 sec)
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