Oracle删除行匹配多个值

Question

我想做的事情如下:

DELETE FROM student WHERE
student.course, student.major IN
(SELECT schedule.course, schedule.major FROM schedule)

但是,您似乎只能在IN运算符中使用一列.真的吗？看起来像这样的查询应该是可能的.

Answer 1

不,你只需要括号:

DELETE FROM student WHERE
(student.course, student.major) IN
(SELECT schedule.course, schedule.major FROM schedule)

Answer 2

您还可以使用EXISTS子句:

DELETE FROM student WHERE
EXISTS
(
  SELECT 1 FROM schedule 
  WHERE schedule.course=student.course 
  AND schedule.major=student.major
)

Answer 3

DELETE FROM student WHERE
(student.course, student.major) IN
(SELECT schedule.course, schedule.major FROM schedule)

在where子句中围绕您的条款添加parens.干杯!