日期不能交叉的检测算法

select top 1 * from demotab where ( ‘ “&start_time&” ‘ <= start_time and ‘ “&end_time&” ‘ >= end_time) or — 判断新日期段与原日期段是否存在外包含 ( ‘ “&start_time&” ‘ >= start_time and ‘ “&end_time&” ‘ <= end_time) or — 判断新日期段与原日期段是否存在内包含 ( ‘ “&start_time&” ‘ <= start_time and ‘ “&end_time&” ‘ <= end_time and ‘ “&end_time&” ‘ >= start_time) or — 判断新日期段与原日期段是否存在左交叉 ( ‘ “&start_time&” ‘ >= start_time and ‘ “&start_time&” ‘ <= end_time and ‘ “&end_time&” ‘ >= end_time) — 判断新日期段与原日期段是否存在右交叉

前提是输入的end_time是大于start_time 如果SQL语句有返回记录则日期有冲突，否则则正确！

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