Sql Select disctince entries from Master Table Depending on Values in Trasact Table

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Hello,

I am not a PRO with SQL, so guys.. I need you help.
I might be laking in basic knowledge here.. but plz help..

I have 2 tables, Master(users) and Transaction(logEntries).

Linked with usrSrNo (index for Users). Log Entries have Transaction logs.

Now I want to Display Distinct Users, based on the logDateTime Desendingly.

As per My Knowledge if I query,

SELECT DISTINCT u.usrName,l.logDateTime FROM users u
JOIN logEntries l on u.usrSrNo = l.usrSrNo
ORDER BY l.logDateTime DESC

Returns me user listing Sorted according to LogDateTime descending, but they are not distict. How can I Get distinct listing?

Plz Help.

Nik

Posted 24-May-10 11:53am

ImNAM

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Christian Graus · Answer 1 · 2010-05-24T13:49:00

Solution 1

I think you need to select the top date, to make it return one date per user. I dont know if max works for dates ? A group by clause is tge other thing, select the highest date Nd group by user.

Posted 24-May-10 13:49pm

Christian Graus

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ImNAM 28-May-10 15:23pm

I tried selecting max(logDate) (and aslo TOP 1) ..
When I try to implement order by on logDate, it fails and gives me some multiple user listing.
Also when I want to implement WHERE clasuse on logDate, it fails..
again, I want to describe the table structure..

User Table
-----------
usrSrNo INT, usrName VARCHAR

logTable
----------
logSrNo INT, logType, logDateTime, usrSrNo

logTable can have multiple entries for same user on same date.
I want to show list of users based on selection like, today, this week, this Month (they should be sorted by logDate DESC)

I also tried with creating View with joint on both tables, It works when I dont have to mention date range, but when I mentione date range in WHERE clause, it fails. as I want to order by, I need to mention logDate in select.. and once I mention it into select.. it returns multiple values.

Abhinav S · Answer 2 · 2010-05-24T17:33:00

Solution 2

You are setting DISTINCT on username and then on logDateTime.

You can group by username and then put a distinct on logDateTime.

Posted 24-May-10 17:33pm

Abhinav S