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POMysql select with CASE not retrieving other column value?
 

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  1. POMysql select with CASE not retrieving other column value?
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    <p>As the answer that I got receive from my question which drive me nuts applying to my code for some reason, why it did not worked.</p> <p>Here's a part of my data on table.</p> <p><img src="https://i.stack.imgur.com/E8ML8.png" alt="enter image description here"></p> <p><strong>Original Code:</strong></p> <pre><code>SELECT AGE_RANGE, COUNT(*) FROM ( SELECT CASE WHEN YearsOld BETWEEN 0 AND 5 THEN '0-5' WHEN YearsOld BETWEEN 6 AND 10 THEN '6-10' WHEN YearsOld BETWEEN 11 AND 15 THEN '11-15' WHEN YearsOld BETWEEN 16 AND 20 THEN '16-20' WHEN YearsOld BETWEEN 21 AND 30 THEN '21-30' WHEN YearsOld BETWEEN 31 AND 40 THEN '31-40' WHEN YearsOld &gt; 40 THEN '40+' END AS 'AGE_RANGE' FROM ( SELECT YEAR(CURDATE())-YEAR(DATE(birthdate)) 'YearsOld' FROM MyTable ) B ) A GROUP BY AGE_RANGE </code></pre> <p>and here is the result.</p> <p><img src="https://i.stack.imgur.com/GguHS.png" alt="enter image description here"></p> <p>What I'm trying to do is, I'm trying to add another column which would count on how many people who is in that area which would be <strong>location</strong> as you would see on the picture on top which includes Perth, Western Australia, Sunbury, Victoria and so on.</p> <p><strong>First attempt to fix my problem</strong></p> <p>As you would see below, I've added location, and COUNT(location) loc to get the name of the location and count on how many location that is duplicated in the table.</p> <pre><code>SELECT AGE_RANGE, COUNT(*), location, COUNT(location) loc FROM ( SELECT CASE WHEN YearsOld BETWEEN 0 AND 5 THEN '0-5' WHEN YearsOld BETWEEN 6 AND 10 THEN '6-10' WHEN YearsOld BETWEEN 11 AND 15 THEN '11-15' WHEN YearsOld BETWEEN 16 AND 20 THEN '16-20' WHEN YearsOld BETWEEN 21 AND 30 THEN '21-30' WHEN YearsOld BETWEEN 31 AND 40 THEN '31-40' WHEN YearsOld &gt; 40 THEN '40+' END AS 'AGE_RANGE', 'location' FROM ( SELECT YEAR(CURDATE())-YEAR(DATE(birthday)) 'YearsOld' FROM event_participants ) B ) A FROM event_participants WHERE location &lt;&gt; '' GROUP BY location HAVING loc &gt;= 1 ORDER BY loc DESC LIMIT 5 </code></pre> <p>Which results to..</p> <p><img src="https://i.stack.imgur.com/SWnRr.png" alt="enter image description here"></p> <p>Obviously, hearing from the aid of god doesn't work out to well..</p> <p><strong>My second attempt to fix this problem</strong></p> <pre><code>SELECT AGE_RANGE, COUNT(*), location FROM ( SELECT CASE WHEN YearsOld BETWEEN 0 AND 5 THEN '0-5' WHEN YearsOld BETWEEN 6 AND 10 THEN '6-10' WHEN YearsOld BETWEEN 11 AND 15 THEN '11-15' WHEN YearsOld BETWEEN 16 AND 20 THEN '16-20' WHEN YearsOld BETWEEN 21 AND 30 THEN '21-30' WHEN YearsOld BETWEEN 31 AND 40 THEN '31-40' WHEN YearsOld &gt; 40 THEN '40+' END AS 'AGE_RANGE', 'location' FROM ( SELECT YEAR(CURDATE())-YEAR(DATE(birthday)) 'YearsOld' FROM event_participants ) B ) A GROUP BY AGE_RANGE </code></pre> <p>And the result is...</p> <p><img src="https://i.stack.imgur.com/1BWuh.png" alt="enter image description here"></p> <p>Instead of <strong>showing</strong> the name of the countries, it only show location. </p> <p>Well.. </p> <p>Long story short, what's wrong with the code? Any solution for this stuff?</p> <p>It was like, my desired result would be,</p> <pre><code>AGE_RANGE COUNT(*) location total number of same location 16-20 4 Name of location # 21-30 45 Name of location # 31-40 79 Name of location # 40+ 102 Name of location # </code></pre>
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    1. USTaryn
    1. USWesley Brian Lachenal
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    1. COPlease use SQL fiddle :)
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      1. POMysql select with CASE not retrieving other column value?
      1. USVivek Sadh
    2. COif `location` is a column, don't wrap it with single quote, `AS 'AGE_RANGE', location` << remove it and see if it works.
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      1. USJohn Woo
 

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