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count between rows

count between rows

count between rows


I have table that logs login and logout and look like this

Login timestamp
Logout timestamp

No to the problem
I whant to take out in second the time between every login times

Please help

RE: count between rows

Do you mean you want to know (A) how many seconds it was since the previous login, or (B) how many seconds each session is?

Date-time management is an area where many DBMS products are far from standard compliant! The SQL statements below are both ANSI/ISO standard compliant:

SELECT (login - (SELECT MAX(login) FROM loggtable AS l_sq
                 WHERE l_sq.user = l_main.user
                 AND   l_sq.login < l_main.login)) SECOND(10)
FROM logtable AS l_main

SELECT (logout - login) SECOND(10)
FROM logtable

Note that USER is a reserved word in ANSI/ISO SQL. To avoid future problems when upgrading your DBMS, you'd better replace that column name, or double quote it (i.e. "user").

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