在MySQL中按日期分组显示记录
要在MySQL中对日期进行分组，请使用GROUPBY子句-
mysql> create table DemoTable2002 ( CustomerName varchar(20), CustomerShippingDate datetime );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable2002 values('Chris','2019-01-10');
mysql> insert into DemoTable2002 values('David','2018-12-31');
mysql> insert into DemoTable2002 values('David','2019-12-16');
mysql> insert into DemoTable2002 values('Chris','2018-12-01');使用select语句显示表中的所有记录-
mysql> select * from DemoTable2002;
这将产生以下输出-
+--------------+----------------------+ | CustomerName | CustomerShippingDate | +--------------+----------------------+ | Chris | 2019-01-10 00:00:00 | | David | 2018-12-31 00:00:00 | | David | 2019-12-16 00:00:00 | | Chris | 2018-12-01 00:00:00 | +--------------+----------------------+ 4 rows in set (0.00 sec)
这是通过按日期分组显示记录的查询-
mysql> select date(min(CustomerShippingDate)),date(max(CustomerShippingDate)),CustomerName from DemoTable2002 group by CustomerName;
这将产生以下输出-
+---------------------------------+---------------------------------+--------------+ | date(min(CustomerShippingDate)) | date(max(CustomerShippingDate)) | CustomerName | +---------------------------------+---------------------------------+--------------+ | 2018-12-01 | 2019-01-10 | Chris | | 2018-12-31 | 2019-12-16 | David | +---------------------------------+---------------------------------+--------------+ 2 rows in set (0.00 sec)