SQL：从2列中筛选2个匹配条件的数据

Question

我有一张这样的桌子

如何获得仅在数学上不及格的学生姓名？

Answer 1

尝试一下：

SELECT * 
from mytable 
where subject = 'math' and result = 'fail' AND name NOT IN (
   select name from mytable where subject != 'math' AND result = 'fail'
)