在 MySQL 查詢中新增 45 天間隔的天數,並在新列中顯示輸出
為此,你可以使用 date_add()。我們先建立一個表 -
mysql> create table DemoTable1930 ( DueTime datetime ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些記錄 -
mysql> insert into DemoTable1930 values('2017-10-21'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2019-12-14'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2018-11-26'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2014-06-16'); Query OK, 1 row affected (0.00 sec)
使用 select 語句顯示錶中的所有記錄 -
mysql> select * from DemoTable1930;
這會產生以下輸出 -
+---------------------+ | DueTime | +---------------------+ | 2017-10-21 00:00:00 | | 2019-12-14 00:00:00 | | 2018-11-26 00:00:00 | | 2014-06-16 00:00:00 | +---------------------+ 4 rows in set (0.00 sec)
以下是如何新增天數的查詢 -
mysql> select DueTime,date_add(DueTime, interval 45 day) as ManyDays from DemoTable1930;
這會產生以下輸出 -
+---------------------+---------------------+ | DueTime | ManyDays | +---------------------+---------------------+ | 2017-10-21 00:00:00 | 2017-12-05 00:00:00 | | 2019-12-14 00:00:00 | 2020-01-28 00:00:00 | | 2018-11-26 00:00:00 | 2019-01-10 00:00:00 | | 2014-06-16 00:00:00 | 2014-07-31 00:00:00 | +---------------------+---------------------+ 4 rows in set (0.00 sec)
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