mysql 查询两个时间段是否有交集的情况

数据库的字段 start_time, end_time

输入的字段 a,b

第一种

SELECT * FROM test_table
WHERE
    (start_time >= a AND start_time <= b)
    OR (start_time <= a AND end_time >= b)
    OR (end_time >= a AND end_time <= b)

第二种

SELECT * FROM test_table
WHERE
    NOT (
        (end_time < a
        OR (start_time > b)
    )

两种结果相同