sql - Count DateTime Stamp For Results -

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i have table containing list of userids , datetime stamp when transaction carried out. looks following:

userid | stamp     john11| 01/01/2013 01:15:27

i return query shows period of time how many transactions each user has done.

i have tried count due time part of stamp counts each individual millisecond rather overall.

thanks in advance

use time_to_sec function actual value. 

select count(userid), userid table time_to_sec(stamp) between  fromtime , totime -- fromtime , totime interval period

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