How to identify wheather particular person is engaged in particular time slot in SQL QUERY?

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I Have one table in sql

SQL

Date            Day     Start Time  End Time  Subject   Teacher
2014-06-02	Monday	2:30 PM	    04:30 PM  Maths	Mr.Smith
2014-06-10	Tuesday	2:30 PM	    04:30 PM  Science   Mr.Ayar
2014-06-16	Monday	2:30 PM	    04:30 PM  Maths	Mr.Smith
2014-06-02	Monday	3:30 PM	    04:30 PM  Maths	Mr.Smith Inserted New Row

I want to make query to check Mr.Smith is already engaged in inserted time slot

Posted 4-Jun-14 0:17am

Yagnik_Vishal

Updated 4-Jun-14 0:19am

v3

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CPallini · Answer 1 · 2014-06-04T00:22:00

Solution 1

If either the begin or the end of your time slot is between (that particular day) 'Start Time' and 'End Time' then that person is already engaged. It is not a difficult query to write.

Posted 4-Jun-14 0:22am

CPallini

Magic Wonder · Answer 2 · 2014-06-04T20:38:00

Solution 3

Member 10272815....i hope below query will clarify your raised overlap.

SQL

SELECT COUNT(1) FROM Your_Table (NOLOCK) WHERE teacher = 'Mr.Smith' And Day = 'Monday'
AND [Start Time] BETWEEN 'Your Start Time' AND 'Your End Time' OR [END Time] BETWEEN 'Your Start Time' AND 'Your End Time'

Posted 4-Jun-14 20:38pm

Magic Wonder

Magic Wonder · Answer 3 · 2014-06-04T03:39:00

Solution 2

Hi,

Put a check before inserting a new record. If it returns more than 0 output than record for specified criteria is available else not.

Check query is below

SELECT COUNT(1) FROM Your_Table (NOLOCK) WHERE teacher = 'Mr.Smith' And Day = 'Monday'
AND 'Your Start Time' BETWEEN [Start Time] AND [END TIME]

Hope this will help you.

Posted 4-Jun-14 3:39am

Magic Wonder

Comments

Member 10272815 4-Jun-14 10:22am

That only covers one of three potential overlaps. New start time can fall inside an existing appointment, new end time can fall inside an existing appointment, or the new appointment can entirely encompass an existing appointment.

If new start time is before existing end time, and new end time is after existing start time then you should find all conflicts.