Hiển thị bản ghi nhóm theo ngày trong MySQL

Sử dụng GROUP BY trên cột ngày. Tạo bảng:

mysql> create table DemoTable2002 ( CustomerName varchar(20), CustomerShippingDate datetime ); Query OK, 0 rows affected (0.61 sec)

Thêm dữ liệu:

mysql> insert into DemoTable2002 values('Chris','2019-01-10'); Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable2002 values('David','2018-12-31'); Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable2002 values('David','2019-12-16'); Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable2002 values('Chris','2018-12-01'); Query OK, 1 row affected (0.12 sec)

Hiển thị dữ liệu:

mysql> select * from DemoTable2002;

+--------------+----------------------+
| 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)

Truy vấn nhóm theo CustomerName, lấy ngày nhỏ nhất và lớn nhất:

mysql> select date(min(CustomerShippingDate)), date(max(CustomerShippingDate)), CustomerName from DemoTable2002 group by CustomerName;

Kết quả:

+---------------------------------+---------------------------------+--------------+
| 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)