SQLite的第二个日期大于第一个日期

Question

In my database I have patient records and in the table have column name Registered_Date in this yyyy-mm-dd format so when I execute query like

SELECT Patient_ID,First_Name,Middle_Name,Last_Name 
FROM Patient_Records 
WHERE Registered_Date BETWEEN '2019-01-25' AND '2018-10-01'

There is no result...

As you can see the first date is greater than the second date but there is no result, but if the first date is less than the second date it will result all the patient whose registered on the selected date.

Answer 1

Everything works as intended.

From the SQLite documentation :

The BETWEEN operator is logically equivalent to a pair of comparisons. x BETWEEN y AND z is equivalent to x >= y AND x <=z

So if the first date is greater than the second (ie y > z ), the condition will always be evaluated as false, no matter what value ( x ) it is given.