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sql query.

i have 2 tables...  client and games.....

in client i have many columns, of which 2 are client id and user id

in games i have many columns , of which one is client id

now i need to get to know how many games are generated by the user within 30 days.......... from that userid.



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sakvk
Asked:
sakvk
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1 Solution
 
Kevin CrossChief Technology OfficerCommented:
Try something like this substituting my made up column names with real ones.
SELECT Count(g.*) As NumGamesPlayed
FROM client c INNER JOIN games g
ON c.clientID = g.clientID
WHERE c.userID = 'u1234'
AND g.datePlayed >= DateAdd(dd, -30, DateDiff(dd, 0, getdate()))

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Terry WoodsIT GuruCommented:
select client.userid, count(*)
from client inner join games on client.clientid = games.cliented
group by client.userid
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Terry WoodsIT GuruCommented:
Ignore my suggestion... it was incomplete, and mwvisa1's looks good!
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sakvkAuthor Commented:
hi mwvisa1,

when u say
g.datePlayed >= DateAdd(dd, -30, DateDiff(dd, 0, getdate())), whts dd? in that... why do we need to do DateAdd and then Datediff....

Can I just do a DateDiff(timestamp,g.dateplayed) < '45'
 
please let me know...

the other part of the query seems good.
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Kevin CrossChief Technology OfficerCommented:
>>now i need to get to know how many games are generated by the user within 30 days.......... from that userid.

g.datePlayed >= DateAdd(dd, -30, DateDiff(dd, 0, getdate()))

dd = day interval
-30 = goes back 30 days from getdate() (i.e. today)
DateDiff = used to ensure that we go back to 30 days ago at midnight, so that all games for that day are included regardless of time.  If you just do DateAdd it will add x number of days with current timestamp which in a >= statement will exclude records for that day with timestamps earlier than current time the query is run.  

Hopefully that makes sense.
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Kevin CrossChief Technology OfficerCommented:
g.datePlayed ==> column name in your games or whichever table is used to determine when a game was generated/played/etc.  This is field you use to determine what is 30 days ago, so whatever the name is change that here.  
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sakvkAuthor Commented:
so can i say dd is CURTIMESTAMP()

DateAdd(CURRENT_TIMESTAMP, -30, DateDiff(CURTIMESTAMP(), 0, getdate()))

as all the time is in date and time format
i think.. its DATE_ADD or ADDDATE......

if i am abl to get this , then the whole query works......
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Kevin CrossChief Technology OfficerCommented:
I am sorry, that was bad of me too assume.  What SQL platform are you on?  CURRENT_TIMESTAMP() is MySQL I believe, am I correct on that?  

If so, please use this as reference for functions I am about to use:
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html
(specifically) http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_date-add

DATE_ADD(NOW(), INTERVAL -30 DAY)

NOW() - INTERVAL 30 DAY

For SQL server, the DateAdd(dd, -30, DateDiff(dd, 0, getdate())) was already implemented code, no need to change anything unless you want to adjust the 30 to go more/less days in past.
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Kevin CrossChief Technology OfficerCommented:
Putting it together:
SELECT Count(g.*) As NumGamesPlayed
FROM client c INNER JOIN games g
ON c.clientID = g.clientID
WHERE c.userID = 'u1234'
AND g.datePlayed >= DATE_ADD(DATE(NOW()), INTERVAL -30 DAY); 

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sakvkAuthor Commented:
yes boss this worked.. thanku
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sakvkAuthor Commented:
very happy with the solution....
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Kevin CrossChief Technology OfficerCommented:
You are welcome.
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