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query help required.

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i have having a table name callhistory and the info this table is holding is

A-No, B-NO, date time, serialno

the records i want to take out are the over lapping calls .

e.g. if i am making a call at 12:00am from a cli 5884086 and after i disconnect my call at 12:10am i cannot make another call starting at 12:05am.
means the 1st call disconnected at 12:03am but due to some malfunction the counter didn't stopped and kept on going while i made another call at 12:05am.

i would like to make a query to take out all such overlapping calls from a huge database.

can any one please help me out.

regards
Kazim
Aug 16 '07 #1
1 955
debasisdas
8,127 Recognized Expert Expert
You need to write a self join and compare the start time and end time.
Aug 16 '07 #2

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