Can You Help Me About A SQL Sentence

May 28, 2008

Hello forum. I address you in order to help me for create a little sentence.

the problem is as:
I have a table "STAMPING" that save data as:


TIMESTAMP------------USER_ID-----TERMINAL_ID----CHIP_ID
19/05/1982 15:30:31 1 1 1
19/05/1982 15:31:29 1 1 1
19/05/1982 15:31:55 1 1 1
19/05/1982 16:25:46 1 1 1
19/05/1982 16:26:23 1 1 1
19/05/1982 16:26:34 1 1 1
19/05/1982 22:23:56 1 1 1
19/05/1982 22:24:23 1 1 1


and I would need to filter them as-->


TIMESTAMP------------USER_ID-----TERMINAL_ID----CHIP_ID
19/05/1982 15:30:31 1 1 1
19/05/1982 15:31:29 1 1 1
19/05/1982 15:31:55 1 1 1
19/05/1982 16:25:46 1 1 1
19/05/1982 16:26:23 1 1 1
19/05/1982 16:26:34 1 1 1
19/05/1982 22:23:56 1 1 1
19/05/1982 22:24:23 1 1 1
20/05/1982 06:10:29 1 1 1
20/05/1982 06:11:51 1 1 1


TIMESTAMP------------USER_ID-----TERMINAL_ID----CHIP_ID
19/05/1982 15:30:31 1 1 1 <<<----
less (difference) --> 00:56:03
19/05/1982 16:26:34 1 1 1 <<<----
19/05/1982 22:24:23 1 1 1 <<<----
less (difference) --> 07:45:00(+/-)
20/05/1982 06:11:51 1 1 1 <<<----


So, I need to delete the "timestamps" the an user has done, which the difference between one stamping and the following one is less than 2 minutes for the inputs for entrances and I need to remove it when the "stampings" which the difference between an one stamping and the previous one is less than 2 minutes for exits.

Can you help me please?
I will appreciate a lot your help.

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