聊聊mysql的多列组合查询

create table t_demo(
   id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   name varchar(10),
   score int
);

insert into t_demo(name,score) values('a',10);
insert into t_demo(name,score) values('b',20);
insert into t_demo(name,score) values('c',30);
insert into t_demo(name,score) values('d',40);
insert into t_demo(name,score) values('d',50);
insert into t_demo(name,score) values('e',60);

select * from t_demo where (name,score) in (('c',30),('e',60));
+----+------+-------+
| id | name | score |
+----+------+-------+
| 3  | c    | 30    |
| 6  | e    | 60    |
+----+------+-------+
2 rows in set
Time: 0.112s

select * from t_demo where (name,score) = ('c',30) or (name,score) = ('e',60);
+----+------+-------+
| id | name | score |
+----+------+-------+
| 3  | c    | 30    |
| 6  | e    | 60    |
+----+------+-------+
2 rows in set
Time: 0.119s