Solved

MySQL query in Access

Posted on 2014-04-11
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Last Modified: 2014-04-14
A collegue requested I modify this query (for MS Access) so that he gets the latest date (adate) from the projectactivity table as well as the list of projects:

original query:
SELECT * FROM projects 
WHERE projects.active='yes'

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I gave him this query, which works well in MySQL:
SELECT * FROM projects 
LEFT OUTER JOIN (SELECT projectactivity.projectid as id,max(adate) as latestdate FROM projectactivity WHERE projectactivity.projectid='10335-2') as derivedTable ON projects.ProjectID=id
WHERE projects.active='yes' 

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I don't use Access enough to know why this does not work for him in Access.  

NOTE:In his MS Access setup, he is connecting to the same MySQL tables that I tested my query on.  He uses Access to format the MySQL data into printable report formats.
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Comment
Question by:Zipbang
  • 2
4 Comments
 
LVL 52

Assisted Solution

by:Julian Hansen
Julian Hansen earned 250 total points
ID: 39993904
Try this

SELECT * FROM projects 
    LEFT OUTER JOIN (
       SELECT projectactivity.projectid as id,max(adate) as latestdate 
       FROM projectactivity WHERE projectactivity.projectid='10335-2'
     ) AS derivedTable 
     ON projects.ProjectID=derivedTable.id
WHERE projects.active='yes' 

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Author Comment

by:Zipbang
ID: 39994366
Julian,

This helps, but I think I misunderstood his request.

He wants a query that shows  all active projects (active='yes') from the projects table and the latest adate (max(adate)) for each one when adate is in the table named projectactivity

SELECT * FROM projects 
--  join on the latest date from the projectactivity table, where projectactivity.id=projects.id
WHERE projects.active='yes'
 

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Sorry for the confusion, am I clear here?
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LVL 40

Accepted Solution

by:
Sharath earned 250 total points
ID: 39995067
remove the WHERE clause and I think you missed the GROUP BY clause.
SELECT * FROM projects 
    LEFT OUTER JOIN (
       SELECT projectactivity.projectid as id,max(adate) as latestdate 
       FROM projectactivity GROUP BY projectactivity.projectid
     ) AS derivedTable 
     ON projects.ProjectID=derivedTable.id
WHERE projects.active='yes' 

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0
 
LVL 52

Expert Comment

by:Julian Hansen
ID: 39995911
Just checking, why do you have this filter in your sub query

WHERE projectactivity.projectid='10335-2'

Will you only ever by searching on that projectid?
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