SQL查询以查找日期范围内的所有数据，该日期范围介于两个日期之间

Question

Task Table
id  name    start_date  expiry_date
1   Task 1  09-05-2016  11-05-2016
2   Task 2  10-05-2016  13-05-2016
3   Task 3  11-05-2016  12-05-2016 
4   Task 4  17-05-2016  20-05-2016
5   Task 5  18-05-2016  26-05-2016

我需要查找给定日期范围内的所有任务，其中范围内的每个日期都在start_date和expiry_date之间。假设输入为10-05-2016至12-05-2016。

id  name    start_date  expiry_date
1   Task 1  09-05-2016  11-05-2016
2   Task 2  10-05-2016  13-05-2016
3   Task 3  11-05-2016  12-05-2016 

Answer 1

您可以将此条件用于check if two date ranges overlap：

WHERE 
    StartA <= EndB 
    AND EndA >= StartB

您的查询应该是：

SELECT *
FROM tbl
WHERE
    start_date <= '12-05-2016'
    AND expiry_date >= '10-05-2016'

Answer 2

希望start_date始终小于expiry_date

SELECT * FROM Task WHERE start_date <= '12-05-2016' AND expiry_date >= '10-05-2016'