源表单据
+----+----------+-------+
| id | username | score |
+----+----------+-------+
| 1 | user1 | 50 |
| 2 | user2 | 98 |
| 3 | user3 | 67 |
| 4 | user4 | 89 |
| 5 | user5 | 34 |
| 6 | user6 | 100 |
| 7 | user7 | 65 |
| 8 | user8 | 87 |
| 9 | user9 | 97 |
| 10 | user10 | 55 |
+----+----------+-------+
汇总要求
+------+--------+
| 及格 | 不及格 |
+------+--------+
| 7 | 3 |
+------+--------+
两种sql方式实现
select sum(if(score>=60,1,0)) 及格,sum(if(score<60,1,0)) 不及格 from user;
select(select count(*) from user where score>=60) 及格,(select count(*) from user where score<60) 不及格;