Question

I am having a table which has the fields: staff_id, leave_applied_from, leave_applied_to.

+----------+--------------+------------+
| staff_id | applied_from | applied_to |
+----------+--------------+------------+
|     1    | 2012-06-21   | 2012-06-21 |
|     2    | 2012-06-21   | 2012-06-23 |
+----------+--------------+------------+

So the requirement is, If the staff_id 1 tries to enter the date 2012-06-21 it should not allow to enter it, if staff_id 2 tries to enter the date 2012-06-22 it should not allow the staff to enter.

I know how to show errors in PHP side, but I don’t know how to check the database whether the date is there in the DB, I don’t know how to check both the fields in one single MySQL query.

The query should check for staff_id first and then both the other fields(applied_from, applied_to). If the staff has entered the same date range already it should give error.

Answer 1

Please try the below:

SELECT * from tbl where (applied_from =< @inputdate AND applied_to >= @inputdate) 
AND staff_id=@inputid

If the query returns record, that means the key in date is within range and you could prompt error.