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POhaving an issue with mysql query to create views
 

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  1. POhaving an issue with mysql query to create views
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    <p>Starting out with mysql and struggling with this issue, i would appreciate the help</p> <p>I have an example table for software sales like this, the id is auto incremented and the entries are made as they are downloaded</p> <pre><code> ID | App name | platform | release date |downloadDate |price ====+============+==========+=============+==============+====== 1 | calculator | windows | 2013-03-01 | 2013-01-21 | $10 2 | text editor| mac | 2013-04-07 | 2013-02-24 | $8 3 | mp3 player | mac | 2013-01-23 | 2013-01-12 | $12 4 | calendar | linux | 2012-08-15 | 2013-04-14 | $5 5 | mp3 player | windows |2013-02-11 | 2013-03-15 | $12 6 | text editor| linux |2012-10-13 | 2013-03-22 | $8 7 | calculator | mac |2013-04-24 | 2013-05-17 | $10 8 | mp3 player | linux |2013-04-16 | 2013-07-03 | $12 9 | text editor| linux |2013-03-22 | 2013-06-12 | $8 10 | calendar | mac |2012-08-15 | 2013-04-14 | $5 </code></pre> <p>what I'm trying to do is create 3 views to display the data </p> <ol> <li><p>show the App name and the total for all platforms for that App and order then descending that x would be the total for all platform (win/mac/linux)</p> <p>ex. </p> <pre><code>App name | total ===========+====== calculator | x mp3 player | x text editor| x </code></pre></li> <li><p>view show the App name and the total downloads for each platform and order then descending</p> <p>ex.</p> <pre><code>App name |platform |total ===========+=========+===== calculator | windows | 12 calculator | mac | 6 calculator | linux | 2 </code></pre></li> <li><p>show the App name and the total for all platforms for that App and order then by price descending</p> <p>ex.</p> <pre><code>App name | total |price ===========+=======+==== calculator | x |$10 mp3 player | x |$12 text editor| x |$8 </code></pre></li> </ol> <p>i have searched for an answer but could not find a very close case, it's a bit long winded post but it's as best as i can explain it?</p>
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    1. UShjpotter92
    1. USBob Machine
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      1. POhaving an issue with mysql query to create views
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    1. COWhat did you try? What went wrong?
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      1. USBrad Mace
    2. COYou should read on database normalization, your downloads data should be in a different table than the app information (name,price,etc.)
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    3. COthanks @koala_dev i looked into it and it's an important concept to know, but i thought it would not be a good idea here, this is my though process, but i welcome opinions, the db will track the sales, release date, user details, num of downloads and be used as download counter source, with more info going in than coming out, so i thought a 'main' db with everything and the views with only what was needed, say for ex to get num of downloads or monthly sales, the normalisation would mean those 'expensive' InnerJoins for everything including what was not needed every time, do i have this wrong?
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