Postgresql i have to return 0 - postgresql

Question

I'm trying to make one postgreSQL 9.3 query.The problem is here i have to count all cleaners rated below 4 rating.Here is my query
SELECT count(ratings.score) as below, avg(ratings.score) as avg_rating, cleaners.first_name, cleaners.last_name, cleaners.id, cleaners.created_at
FROM "cleaners"
LEFT JOIN ratings ON ratings.cleaner_id = cleaners.id
GROUP BY cleaners.first_name, cleaners.last_name, cleaners.id, cleaners.created_at
here is the following result:
{
"HTTP_CODE": 200,
"cleaners": [
{
"id": 29,
"rating_below_3_stars": 1,
"avg_rating": "5.0",
"first_name": "asen",
"last_name": "asenov"
},
{
"id": 35,
"rating_below_3_stars": 2,
"avg_rating": "2.5",
"first_name": "Simepl",
"last_name": "cleaner"
}
]
}
The cleaner with id "29" his rating_below_3_stars have to e set to 0
What i want is:
{
"HTTP_CODE": 200,
"cleaners": [
{
"id": 29,
"rating_below_3_stars": 0,
"avg_rating": "5.0",
"first_name": "asen",
"last_name": "asenov"
},
{
"id": 35,
"rating_below_3_stars": 2,
"avg_rating": "2.5",
"first_name": "Simepl",
"last_name": "cleaner"
}
]
}

Answer 1

you count only the ratings below 4
SELECT sum(case when ratings.score<=3 then 1 else null end) as below,
avg(ratings.score) as avg_rating,
cleaners.first_name, cleaners.last_name, cleaners.id,
cleaners.created_at
FROM "cleaners"
LEFT JOIN ratings ON ratings.cleaner_id = cleaners.id
GROUP BY cleaners.first_name, cleaners.last_name, cleaners.id, cleaners.created_at