Sql 如何在两列的日期之间选择日期？

此选项不起作用：

SELECT collaborators.fullname, learnings.state_id, orgs.name AS orgs_name, courses.name AS courses_name
FROM learnings
LEFT JOIN collaborators ON learnings.person_id = collaborators.id
LEFT JOIN orgs ON collaborators.org_id = orgs.id
LEFT JOIN courses ON learnings.course_id = courses.id
WHERE collaborators.org_id = :org_id
AND learnings.start_date BETWEEN :date1 AND :date2
AND learnings.finish_date BETWEEN :date1 AND :date2

如果您在请求中留下以下内容之一：

AND learnings.start_date BETWEEN :date1 AND :date2

或

然后，选择工作。 请告诉我：

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如何组合此查询中的两列

start\u date

和

finish\u date

，并将它们筛选为一列？

如果您希望两个时间段之间有任何重叠，则可以使用：

AND
learnings.start_date <= :date2 AND
learnings.finish_date >= :date1 

请解释“不工作”。样本数据、预期结果和逻辑的清晰解释将有所帮助。

AND
learnings.start_date <= :date2 AND
learnings.finish_date >= :date1 

AND
learnings.start_date >= :date1 AND
learnings.finish_date <= :date2