Change your database structure like this
Table Leave
emp_id,
leave_id,
leave_Type,
days_applied,
from_date,
to_date,
date_applied
Table Leave Type
leave_Type_id,
leave_Type
Note: Above tables are just for e.g. to solve your problem you can change it.
With above structure you can easily calculate leaves taken by employee and also filter by leave type.
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solved How to assign date at each insertion in sql server c# [closed]