Connecting Three Tables With Left Join And Ordinary Join
I have 3 Mysql tables:
Week (with columns day and hour)
Activity (with columns day, hour, activityid and ac_text)
Person (with columns name and activityid)
I would like to create a scheme showing the activities during a week sorted on days and hours. If I ignore the person table I can fix it with the statement:
Select …. From week left join activity on (week.day = activity.day) and (week.hour = activity.hour) order by day, hour
I can then make a loop (I am usin asp.net) that writes the activities.
My problem is when I try to combine the persons to the activtities in an given hour. How do I do that ? (activity.activityid = person.activityid).
I have a little extra question. When I make the join above and print the result (day, time and activity) there isn’t any output if no activity matches a given day and hour. How do I do when I always want to print day and hour and add activity where such exist.
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Firstly table structure - 1 user has multiple status records. When a new status record is created it gets the current datetime inserted into 'date_created'. user user_id site_id status status notes date_created I wish to display a list of all users and show beside them their current/most recent status record. Here is my code currently: SELECT user.*, status.date_created, status.status, status.notes, DATE_FORMAT(status.date_created,'%l:%i %p') as last_updated_time, DATE_FORMAT(status.date_created,'%e/%c') as last_updated_date FROM user LEFT JOIN status ON status.user_id = user.user_id WHERE user.site_id = 1 GROUP BY user.user_id ORDER BY CASE user.user_id WHEN 8 THEN 0 ELSE user.user_id END Currently via the LEFT JOIN and GROUP this does display a list of all users with 1 status record per user but it's simply the first status record in the table (ordering by id i guess), not the most recent. How can I get it to display the most recent instead, based on date_created. I've tried adding ordering to the left join but this returned an error.
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Left Join Conditions
Two tables. table1, table2 Table 1 contains all unique items. Table 2 contains x references to table 1, unique by customerId I want to do a join onto table2 where table1.id = table2.table1Id AND table2.customerId = the user's ID I can't quite figure out how to work in the idea of an AND into my left join. Unless both those conditions are two, I don't want any data from table2. Only solution I can think of so far is to just left join on the id's, but select the customerId from table2, and as I loop through, check to see if it's supplied and the right id, and keep track of duplicate items from multiple customers myself. Suggestions?
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Left Join Probelm
I'm not all that skilled when it comes to using LEFT JOIN, so I'm not even sure if what I require can be done! This is what I tried to do: $tinfo = mysql_query("SELECT U.username,T.game,T.club,T.date,T.status,T.fee,T.players,T.winner,S.name,S.rules FROM ct_info T LEFT JOIN users U ON U.id=T.host LEFT JOIN styles S ON S.id=T.style WHERE id=$tjump"); $tinfo = mysql_fetch_array($tinfo); T.ct_info stores all information on the tournament including the Host's ID# (T.host). So I wanted it to LEFT JOIN with users U to get their username (U.username) - so I did ON U.id=T.host. ct_info also records the STYLE ID# of the tourmament. the table "style" holds the name and the rules of each style (ID, NAME, RULES) so I did a further LEFT JOIN of styles S with S.id=T.style. All this returns is an error of invalid arguement. I think I may have my LEFT JOIN's in wrong order or something but have tried numerous different ways and it just won't happen for me.
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