Databases
StackOverflow2013
Postsdbo
POselecting values dynamic from columns using pivoting mysql
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POselecting values dynamic from columns using pivoting mysql
    primarykey
    data
    text
    <p>I have a brands table and posts table.</p> <p>Below is their schema </p> <p><strong>Brands</strong> :</p> <blockquote> <p>brands_id, friendly, short ,followers, created, location, brandID, handle, url, pic, utcOffset, posts, engagements, engagedUser, etc(sufficient for current question)</p> </blockquote> <p><strong>Posts</strong> :</p> <blockquote> <p>post_id, brandID, postID, handle, posted, content, postType, comments, etc (sufficient for current question)</p> </blockquote> <p>where postType= link, status,video,question,poll,etc</p> <p>Now I have hardcoded pivoting with the following query:</p> <pre><code>select b.friendly, sum(case when p.postType='link' then 1 else 0 end) as 'link', sum(case when p.postType='video' then 1 else 0 end) as 'video', sum(case when p.postType='status' then 1 else 0 end) as 'status', sum(case when p.postType='photo' then 1 else 0 end) as 'photo', count(p.postType) from brands b, posts p where b.handle in ('chevroletcanada','dodgecanada') and p.handle=b.handle and date(p.posted) BETWEEN "2013-06-02" and "2013-08-11" group by b.friendly </code></pre> <p>But in the above query I have used types of postType statically, i.e for links, status, video, photo. Now if a new postType is added to the posts table, this won't work, as I would have to change the query too. Also if existing values in postType is deleted, then too the query have to be changed again.</p> <p>My question is how can I achieve this dynamically so that when new postType values for instance tweet is added in posts table then tweet will show up in the result sets as well. And the same for deletion of any postType.</p> <p>If you haven't understood question, please inform me.</p> <p>I have read the below posts, but unable to figure out:</p> <p><a href="https://stackoverflow.com/questions/12713824/mysql-or-php-turning-rows-into-columns-dynamically">MySQL or PHP Turning rows into columns dynamically</a></p> <p><a href="https://stackoverflow.com/questions/12598120/mysql-pivot-table-query-with-dynamic-columns">MySQL pivot table query with dynamic columns</a></p> <p>Thanks in advance!!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USsizzyfrisky
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou can't do this with MySQL with a single query.
      singulars
      1. POselecting values dynamic from columns using pivoting mysql
      1. USTom Mac
    2. CO@TomMac No problem. It's fine if I get this done using subqueries or joins
      singulars
      1. POselecting values dynamic from columns using pivoting mysql
      1. USsizzyfrisky
    3. COJust assemble a GROUPed and ORDERed result and handle the display logic at the application level (e.g. a bit of PHP). You can also use a sproc but I don't like that idea.
      singulars
      1. POselecting values dynamic from columns using pivoting mysql
      1. USStrawberry
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload