SQL sub-query check if data exists in another table - sql

Question

I am new to SQL and the question may already exist in some form. I am developing a web app that displays cards that contain title,description and more information regarding a place, and with a sub-query fetches the image data regarding each place. PostgreSQL is used. I want to add a sub-query or join that gets which items are liked by the user from the ones selected(present in the favoritePlaces with the corresponding user_id and place_id received from the query). Sample dynamically generated query:
SELECT places.place_id,
username,
title,
description,
visible,
score,
placelocation,
category,
price,
accessibility,
places.date,
dangerous,
url,
image_id
FROM
(SELECT *
FROM places
GROUP BY place_id
HAVING count(*) < 10) places
LEFT JOIN images ON images.place_id = places.place_id
WHERE description SIMILAR TO Concat('%', '', '%')
AND placelocation =placelocation
AND category =category
AND price =price
AND dangerous =dangerous
AND accessibility =accessibility
OR title SIMILAR TO Concat('%', '', '%')
AND visible=TRUE
AND placelocation =placelocation
AND category =category
AND price =price
AND dangerous =dangerous
AND accessibility =accessibility
The end goal is to have for each item whether it is liked or not(present in the the favoritePlaces table with regards to the current user). favoritePlaces Tables structure:
I looked at this answer: https://stackoverflow.com/a/44773730/14131447 but I am not sure how to implement it.
Sample data within the favoritePlaces table:

Answer 1

I solved the issue by simply adding the case after the SELECT columns
SELECT places.place_id,
username,
title,
description,
visible,
score,
placelocation,
category,
price,
accessibility,
places.date,
dangerous,
url,
image_id, CASE
WHEN EXISTS (select *
from "favoritePlaces"
where "favoritePlaces".place_id = places.place_id AND user_id=128
)
THEN 'true'
ELSE 'false'
END
FROM
(SELECT *
FROM places
GROUP BY place_id
HAVING count(*) < 10) places
LEFT JOIN images ON images.place_id = places.place_id
WHERE description SIMILAR TO Concat('%', '', '%')
AND placelocation =placelocation
AND category =category
AND price =price
AND dangerous =dangerous
AND accessibility =accessibility
OR title SIMILAR TO Concat('%', '', '%')
AND visible=TRUE
AND placelocation =placelocation
AND category =category
AND price =price
AND dangerous =dangerous
AND accessibility =accessibility;