判断两个时间段是否有重叠
(a,b),(c,d)
判断两段时间是否有重叠
方法一
select ‘yes‘ from dual where d>a and c<b;
方法二
select ‘yes‘ from dual where (a, b) overlaps (c,d);
方法三
select ‘yes‘ from dual where a between c and d or d between a and b;
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