Databases
StackOverflow2013
Postsdbo
POHow do I get unique user engagements?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow do I get unique user engagements?
    primarykey
    data
    text
    <p>I am trying to list unique <code>user engagements</code> with the <code>engagement_type</code></p> <p>I used to have the following query.</p> <pre><code>SELECT u.id, u.fname, u.lname FROM ( SELECT id, engagement_type FROM ( SELECT user_id AS id, 'comment' FROM comments WHERE commentable_id = 48136 AND commentable_type = 'Video' UNION ALL SELECT user_id AS id, 'like' FROM likes WHERE likeable_id = 48136 AND likeable_type = 'Video' ) AS a GROUP BY id LIMIT 10 ) b JOIN users u USING (id); </code></pre> <p>Returns:</p> <pre><code>id | fname | lname ------------------------------ 1 | joe | abc 2 | sarah | qer 3 | megan | tryey 4 | john | vdfa </code></pre> <p>Which is fine. Now, I want to include the engagment type. I've come up with this:</p> <pre><code>SELECT u.id, u.fname, u.lname, engagement_type FROM ( SELECT id, engagement_type FROM ( SELECT user_id AS id, 'comment' AS engagement_type FROM comments WHERE commentable_id = 48136 AND commentable_type = 'Video' UNION ALL SELECT user_id AS id, 'like' AS engagement_type FROM likes WHERE likeable_id = 48136 AND likeable_type = 'Video' ) AS a GROUP BY id, engagement_type LIMIT 10 ) b JOIN users u USING (id); </code></pre> <p>Which now returns:</p> <pre><code>id | fname | lname | engagement_type --------------------------------------------------- 1 | joe | abc | comment 2 | sarah | qer | like 3 | megan | tryey | like 4 | john | vdfa | like 1 | joe | abc | like 3 | megan | tryey | comment </code></pre> <p>The only problem with above. The results are not unique anymore. As you can see, Joe and Megan have 2 entries.</p> <p>Any idea how I can get this to work?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAjV Jsy
    1. USChristian Fazzini
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow do I get unique user engagements?
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COtry removing `engagement_type` from `GROUP BY` clause and check if meets your needs.
      singulars
      1. POHow do I get unique user engagements?
      1. USSparKot
    2. COhowever, `joe` had two unique engagements viz, `comment` & `like`. So did `megan`.
      singulars
      1. POHow do I get unique user engagements?
      1. USSparKot
    3. CODepends on what you want to do. Do you want to display only one engagement_type or list like "comment, like"?
      singulars
      1. POHow do I get unique user engagements?
      1. USJakub Kania
 

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