MySQL DML操作--------合并查询结果实战
mysql> desc users1;+-------+---------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------------+------+-----+---------+----------------+
| id | bigint(20) | NO | PRI | NULL | auto_increment |
| name| varchar(64) | NO | | NULL | |
| sex | enum('M','F') | NO | | NULL | |
| age | int(11) | NO | | NULL | |
+-------+---------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
mysql> desc users2;
+-------+---------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------------+------+-----+---------+----------------+
| id | bigint(20) | NO | PRI | NULL | auto_increment |
| name| varchar(64) | NO | | NULL | |
| sex | enum('M','F') | NO | | NULL | |
| age | int(11) | NO | | NULL | |
+-------+---------------+------+-----+---------+----------------+
4 rows in set (0.01 sec)
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