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POWhat is the correct SQL query for this?
 

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  1. POWhat is the correct SQL query for this?
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    <p>I have a table that stores all the user activities. I call it the "sessions" table with fields:</p> <pre><code>+--------------------------------------------------+ | id | content_type | content_id | action | +--------------------------------------------------+ </code></pre> <p>content_type can be 1=videos, 2=slideshows, 3=forms, 4=surveys, 5=websites, 6=interactives</p> <p>content_id is the ID of the actual content. For example I have the "websites" table</p> <pre><code>+---------------------------------------------+ | id | name | url | +------------------+--------------------------+ | 3 | Google | http://www.google.com/ | +------------------+--------------------------+ </code></pre> <p>On the app, the user visited the google.com website. What will be stored on the "sessions" table is:</p> <pre><code>+----------------------------------------------------------+ | content_type | content_id | action | +----------------------------------------------------------+ | 5 | 3 | Visited Google Website | +----------------------------------------------------------+ </code></pre> <p>These contents of the "websites" (or forms, videos, etc.) table can be attached or tagged to a number of product groups.</p> <p>I do this by storing it to a table named "attached_product_groups"</p> <p>on that table, I have the fields: </p> <pre><code>+----------------------------------------------------+ | content_type | content_id | product_group_id | +----------------------------------------------------+ </code></pre> <p>For example I have to attach 3 product groups to the google.com website, from the "product_groups" table:</p> <pre><code>+----------------------------+ | id | name | +----------------------------+ | 3 | Mobile | +----------------------------+ | 8 | Social Networking | +----------------------------+ | 9 | Adsense | +----------------------------+ </code></pre> <p>"attached_product_groups" table will store:</p> <pre><code>+----------------------------------------------------+ | content_type | content_id | product_group_id | +----------------------------------------------------+ | 5 | 3 | 3 | +----------------------------------------------------+ | 5 | 3 | 8 | +----------------------------------------------------+ | 5 | 3 | 9 | +----------------------------------------------------+ </code></pre> <p>Now my question is, how do I select all the "session" logs of a cetain product groups?</p> <p>Given that on my app, I have a dropdown of the product groups. </p> <p>Thanks a lot for helping a beginner like me. :)</p>
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