Question

return a many to one result set in one row in MySQL

Asked by: foxymoron7

Hi all,

I have a web based search using PHP and MySQL.  I'll use three simplified tables and an example query.  The Job table is a list of current and historical jobs performed.  The Contacts table lists all of the contacts associated with a job, employees and external contacts like clients or consultants.   The Person table is basically an "Address Book" type of table with contact info.  Below are the fields in each table that are used in the query.  The tables are existing and cannot be altered.

Job table:
Index (unique ID)
Number
Name

Job_Contact table:
Job_Index (joins to Job table)
Contact_ID (joins to Person table)
Role (defines role of contact - General Contractor, Owner, Consultant, etc.)
Title (function performed on the job, not necessarily the person's current job title)

Person table:
Contact_ID (unique ID)
Person_Name
Job_Title (person's current job title)

The Job_Contact.Title field and the Person.Job_Title field aren't necessarily equal.  When someone performs the same duty as their job title, the Job_Contact.Title field is left blank.  When they perform a duty other than their job title, that duty gets written into the Job_Contact.Title field for that specific job index and this should supercede the Person.Job_Title field in the returned results.  One of the purposes of the query is to be able to find out who did what on a specific job or to find all the jobs where a specific person performed a certain duty.

I'll attach the query and example tables in case they may be useful.

Currently the query returns something like the following when searching for job number 2009002.  John, Sue and Bob all performed the duties of "Project Manager" at some point during the job.

 Number | Name| Project Manager
   
2009002 | Apex | John, Sue
2009002 | Apex | John, Bob


I'd like to be able to return something like:

Number | Name | Project Manager
__________________________
2009002 | Apex | John, Sue, Bob

I'd like to handle it on the database side rather than scripting if possible.  Thank you in advance for any help.


SELECT job.`Number`, job.`Name`, CONCAT(IF(contact_PM.`Contact_ID`<>'', CONCAT(person_PM.`Person_Name`, ', '), ''), person.`Person_Name`) AS `Project Manager`
FROM job
LEFT JOIN job_contact_list contact_PM ON job.`Job_Index`=contact_PM.`Job_Index` AND (contact_PM.`Title`='Sr. Project Manager' OR contact_PM.`Title`='Project Manager')  AND contact_PM.`Role`='General Contractor' 
INNER JOIN Person person_PM ON contact_PM.`Contact_ID`=person_PM.`Contact_ID`
LEFT JOIN job_contact_list contact ON job.`Job_Index`=contact.`Job_Index` AND contact.`Role`='General Contractor'
INNER JOIN person ON contact.`Contact_ID`=person.`Contact_ID` AND (person.`Job_Title`='Sr. Project Manager' OR person.`Job_Title`='Project Manager')
WHERE job.`Number`='2009002'

                                  
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Asked On
2009-10-30 at 14:22:35ID24859756
Tags

MySQL

,

PHP

Topics

MySQL Server

,

PHP and Databases

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: leakim971Posted on 2009-10-30 at 14:30:37ID: 25706940

Hello foxymoron7,

Try something like :

SELECT job.`Number`, job.`Name`, GROUP_CONCAT(CONCAT(person.`Person_Name`)) AS `Project Manager`
FROM job
LEFT JOIN job_contact_list contact_PM ON job.`Job_Index`=contact_PM.`Job_Index` AND (contact_PM.`Title`='Sr. Project Manager' OR contact_PM.`Title`='Project Manager')  AND contact_PM.`Role`='General Contractor' 
INNER JOIN Person person_PM ON contact_PM.`Contact_ID`=person_PM.`Contact_ID`
LEFT JOIN job_contact_list contact ON job.`Job_Index`=contact.`Job_Index` AND contact.`Role`='General Contractor'
INNER JOIN person ON contact.`Contact_ID`=person.`Contact_ID` AND (person.`Job_Title`='Sr. Project Manager' OR person.`Job_Title`='Project Manager')
WHERE job.`Number`='2009002'
GROUP BY job.`Number`, job.`Name`

                                              
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by: leakim971Posted on 2009-10-30 at 14:31:56ID: 25706948

Or :

SELECT job.`Number`, job.`Name`, GROUP_CONCAT(CONCAT(IF(contact_PM.`Contact_ID`<>'', CONCAT(person_PM.`Person_Name`, ', '), ''), person.`Person_Name`)) AS `Project Manager`
FROM job
LEFT JOIN job_contact_list contact_PM ON job.`Job_Index`=contact_PM.`Job_Index` AND (contact_PM.`Title`='Sr. Project Manager' OR contact_PM.`Title`='Project Manager')  AND contact_PM.`Role`='General Contractor' 
INNER JOIN Person person_PM ON contact_PM.`Contact_ID`=person_PM.`Contact_ID`
LEFT JOIN job_contact_list contact ON job.`Job_Index`=contact.`Job_Index` AND contact.`Role`='General Contractor'
INNER JOIN person ON contact.`Contact_ID`=person.`Contact_ID` AND (person.`Job_Title`='Sr. Project Manager' OR person.`Job_Title`='Project Manager')
WHERE job.`Number`='2009002'
GROUP BY job.`Number`, job.`Name`

                                              
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by: leakim971Posted on 2009-10-30 at 14:41:23ID: 25707003

Or again :

SELECT job.`Number`, job.`Name`, contact_PM.`Contact_ID`, GROUP_CONCAT(CONCAT(person.`Person_Name`)) AS `Project Manager`
FROM job
LEFT JOIN job_contact_list contact_PM ON job.`Job_Index`=contact_PM.`Job_Index` AND (contact_PM.`Title`='Sr. Project Manager' OR contact_PM.`Title`='Project Manager')  AND contact_PM.`Role`='General Contractor' 
INNER JOIN Person person_PM ON contact_PM.`Contact_ID`=person_PM.`Contact_ID`
LEFT JOIN job_contact_list contact ON job.`Job_Index`=contact.`Job_Index` AND contact.`Role`='General Contractor'
INNER JOIN person ON contact.`Contact_ID`=person.`Contact_ID` AND (person.`Job_Title`='Sr. Project Manager' OR person.`Job_Title`='Project Manager')
WHERE job.`Number`='2009002'
GROUP BY job.`Number`, job.`Name`

                                              
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by: foxymoron7Posted on 2009-10-30 at 15:09:35ID: 31648236

Thanks a lot.  That worked perfectly.  I made one minor tweek.  I moved the GROUP_CONCAT inside the main CONCAT function so that it wouldn't duplicate the contact.`Title` result.  

CONCAT(IF(contact_PM.`Contact_ID`<>'', CONCAT(person_PM.`Person_Name`, ', '), ''), GROUP_CONCAT(person.`Person_Name`)) AS `Project Manager`

Thanks again, leakim971!

20120131-EE-VQP-002

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