TimeStampDiff in sql

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I have 2 tables and want to know if since a user last login there was an update on a table.

I am using a table for dataentry and another to keep the time stamp of all the user last login

How can I check if the time stamp of each row in dataentry is more recent or not since the last login

I have tried this and I am managing to get the difference, if the answer is negative the entry has been done after the user last logged in, and vice versa if positive.

I need only to get the -ve rows

SQL

SELECT TIMESTAMPDIFF(second, ts, tsLog) as TotalSeconds FROM dataentry,userLogs

Posted 10-May-13 9:21am

datt265

Updated 10-May-13 9:25am

André Kraak

v2

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Zoltán Zörgő 10-May-13 16:01pm

Please provide structure of both tables.

datt265 11-May-13 4:01am

dataentry table --> id, event, ts (ts is timestamp)
userLogs table --> userName, tsLog (tsLog is a timestamp when the user logged last)

Zoltán Zörgő 11-May-13 5:18am

To query what you need, you need to be able to link (reference) these tables by user. But with your current structure you can not.
You need something like this:

dataentry table --> id, event, ts, userId,
userLogs table --> userid, tsLog
users --> userId, Username, other fields related to the user

Or at least:

dataentry table --> id, event, ts, userName
userLogs table --> userName, tsLog

Without something like this it is impossible.

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