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PODatabase schema for efficient attendance management system
 

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    <p>I am developing an attendance system for school which will cater to both employees as well as students.</p> <p>The current db schema is </p> <p><code>attendance</code> table</p> <pre><code>id - primary key for this table daydate int(11) - stores timestamp of current day timing_in varchar(18) - Start time for institution timing_out - Closing time for institution status - Status for the day, can be working day - 1 or holiday - 2 </code></pre> <p>Then there are different tables for staff &amp; students, which store the actual attendance values. </p> <p>For staff, the attendance is stored in <code>attendance_staff</code>. The database schema is</p> <pre><code>attendance_id - foreign key, references attendance table staff_id - id of staff member, references staff master table time_in - stores in timing of a staff member time_out - stores out timing of a staff member status - attendance status - can be one among the list, like present, absent, casual leave, half day, late mark, on duty, maternity leave, medical leave etc </code></pre> <p>For staff, i am storing both present as well as not present entries in the table.</p> <p>Now attendance for students has to be included with it.</p> <p>Since status of each day is already stored in <code>attendance</code> table, can we store not present values for each student in the student attendance table.</p> <p>Like, the student attendance table will store only entries for those days who are not present on a particular day.</p> <p>The schema for <code>attendance_student</code> will be</p> <pre><code>attendance_id - references attendance table student_id - references student table status - will be leave / absent etc other than present. </code></pre> <p>Will it be efficient to calculate the present days from attendance table using outer join??</p> <p>Thanks in advance.</p>
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