select data from a table and fill specific value from another table

I have two tables discussions and votes that are like this

discussions

select data from a table and fill specific value from another table

votes

select data from a table and fill specific value from another table

that parentId in votes is id in discussions table

but exist a problem

I want to have a key with name likeByMe and want to fill this key when select discussions for specific user.
how can I connect these two tables and fill this value when call one query?

I want something like this

select * 
from discussions

and fill likeByMe from votes table for any rows by true or false value

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Given your description, you can use exists:

select d.*,
       (exists (select 1
                from votes v
                where v.parentid = d.id and v.userid = ?
               )
       ) as likedByMe
from discussions d;

The ? is a parameter placeholder for the user you care about.


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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