MySQL中case when语句的用法
2022-06-03MYSQL
mysql数据库中case when语句，用于计算条件列表并返回多个可能结果表达式之一。代码如下:
select subject,sum(case when score<60 then 1 else 0 end) as NO,sum(case when score>=60 then 1 else 0 end) YES from score group by subject; |
通上以上MySQL语句,查询出科目及格人数和不及格人数:
+---------+------+------+ | subject | NO | YES | +---------+------+------+ | linux | 0 | 2 | | mysql | 0 | 2 | | php | 1 | 1 | +---------+------+------+ |
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