排序多个表的有3个表:SQL - 我如何通过公共列
MariaDB [test]> DESCRIBE t1;
+-------+-----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | char(150) | NO | | NULL | |
| time | datetime | NO | | NULL | |
+-------+-----------+------+-----+---------+----------------+
MariaDB [test]> DESCRIBE t2;
+-------+-----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | char(150) | NO | | NULL | |
| time | datetime | NO | | NULL | |
+-------+-----------+------+-----+---------+----------------+
MariaDB [test]> DESCRIBE t3;
+-------+-----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | char(150) | NO | | NULL | |
| time | datetime | NO | | NULL | |
+-------+-----------+------+-----+---------+----------------+
我想加入3个表和排序的所有行与time
领域。
我该怎么做?
你真的想这些表格'join'在一起,或你想'union'在一起? – sgeddes
我想加入。联合删除重复的行。 – Chalist
样本数据和期望的结果将阐明您想要做什么。 –