mysql的左连接应用
mysql> desc branch;+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| bid | int(4) | NO | PRI | | |
| cid | int(3) | NO | | | |
| bdesc | text | NO | | | |
| bloc| varchar(25) | YES| | NULL | |
+-------+-------------+------+-----+---------+-------+
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