I’m implementing a Graphql resolver for complex datatype. I try to use a data loader to avoid N+1
problem. I have a datatype with a counter. Therefore, in one graphql query I need to perform user counting multiple times for defferent types. Currently, I’m trying to combine multiple COUNT(*)
queries within one SQL query. See the pseudocode below.
Pseudo code
# My type
type MyType {
users_count: number
}
# The query returns an array of "MyType"
getMyType(id: ID!): [MyType!]!
# Graphql query
getMyType(id: ID!) {
id
users_count
created_at
}
# This is how I'm trying to do multiple counts
#
SELECT
(SELECT COUNT(*) FROM table_with_users WHERE my_type_id = 1),
(SELECT COUNT(*) FROM table_with_users WHERE my_type_id = 2)
The problem is I may have dozens of counts in one query. Is this going to be efficient for DB? What is the most efficient way of counting in this case?