Question

I’m using the following SELECT statement:

SELECT *
FROM prefix_site_tmplvars
LEFT JOIN prefix_site_tmplvar_contentvalues 
ON prefix_site_tmplvar_contentvalues.tmplvarid = prefix_site_tmplvars.id
LEFT JOIN prefix_site_content
ON prefix_site_tmplvar_contentvalues.contentid = prefix_site_content.id
WHERE prefix_site_tmplvar_contentvalues.value = "chocolate"

This is what I get back:

[id] => 2  
[name] => flavor  
[value] => chocolate

[id] => 2 
[name] => type 
[value] => cookie

This is the result I’d like to get:

[id] => 2
[flavor] => chocolate
[type] => cookie

Is there a way to combine my results so I don’t have a bunch of rows referring to the same ID? If now, how should I handle this?

I’m using Modx and this is working with the Template Variable tables: http://wiki.modxcms.com/index.php/Template_Variable_Database_Tables

Answer 1

You can just use case statements:

SELECT 
    id,
    MAX( CASE WHEN name = 'flavor' THEN value ELSE NULL END ) AS flavor,
    MAX( CASE WHEN name = 'type' THEN value ELSE NULL END ) AS type
FROM prefix_site_tmplvars
    LEFT JOIN prefix_site_tmplvar_contentvalues 
    ON prefix_site_tmplvar_contentvalues.tmplvarid = prefix_site_tmplvars.id
    LEFT JOIN prefix_site_content
    ON prefix_site_tmplvar_contentvalues.contentid = prefix_site_content.id
WHERE prefix_site_tmplvar_contentvalues.value = "chocolate"
GROUP BY id

Of course, this approach only works if you know ahead of time what keys you want to select; but it seems like in this case you do know (flavor + type).