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SQL Join Issue

Posted on 2013-01-14
2
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Last Modified: 2013-01-14
In MySQL I'm working with a database table called Events I didn't design and can't change which has a field EventTime which is a varchar(8) which has entries like '9:00 AM', '11:00 AM', '3:00 PM'.  The table only has entries for certain times during the day.

I need to create a report for a particular day (in essence a day calendar) which lists all the times in ascending order whether or not they have corresponding records in the Events table, but if there is one it should show up.

Ex:

9:00 AM   Event1
10:00 AM  
11:00 AM  Event2
12:00 PM
1:00 PM
2:00 PM Event3
...
6:00 PM

I have created a table TimeOrder with the various text fields of time with an ID field so that I can order properly:

ID                         TimeValue
1                           9:00 AM
2                           10:00 AM
3                           11:00 AM etc

I'm trying to create a left join statement so that I see all the records in TimeOrder (i.e. the full day with all timeslots) with matching records from the Events table when there are any. Here's my SQL Statement

SELECT e.Date, t.TimeValue, e.EventType, trim(e.FName) + trim(e.LName), e.AttCount
FROM TimeOrder t
Inner JOIN enrolled e on t.timevalue = e.eventtime
WHERE e.Date = '2013-01-01'
ORDER BY t.ID

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However my output only has the timeslots with corresponding records in Event (similar to an inner join).

Any thoughts?
0
Comment
Question by:deedub84
2 Comments
 
LVL 41

Accepted Solution

by:
ralmada earned 500 total points
ID: 38775842
Your query IS using INNER JOIN, try with LEFT JOIN, and you could also try

SELECT e.Date, t.TimeValue, e.EventType, trim(e.FName) + trim(e.LName), e.AttCount
FROM TimeOrder t
left JOIN (select * from enrolled WHERE Date = '2013-01-01') e on t.timevalue = e.eventtime
ORDER BY t.ID
0
 
LVL 1

Author Comment

by:deedub84
ID: 38775915
Yep, I copied the inner join query I was using to compare.

However, your subquery solution did the trick.  Thanks!
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