如何在多个列上使用 MySQL DISTINCT 子句？

示例

考虑下表“testing”有 10 行 -

mysql> select * from testing; +------+---------+---------+ | id | fname | Lname | +------+---------+---------+ | 200 | Raman | Kumar | | 201 | Sahil | Bhalla | | 202 | Gaurav | NULL | | 203 | Aarav | NULL | | 204 | Harshit | Khurana | | 205 | Rahul | NULL | | 206 | Piyush | Kohli | | 207 | Lovkesh | NULL | | 208 | Gaurav | Kumar | | 209 | Raman | Kumar | +------+---------+---------+ 10 rows in set (0.00 sec)登录后复制

mysql> Select DISTINCT FNAME,LNAME from testing2; +---------+---------+ | FNAME | LNAME | +---------+---------+ | Raman | Kumar | | Sahil | Bhalla | | Gaurav | NULL | | Aarav | NULL | | Harshit | Khurana | | Rahul | NULL | | Piyush | Kohli | | Lovkesh | NULL | | Gaurav | Kumar | +---------+---------+ 9 rows in set (0.00 sec)登录后复制

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