Question

Is it possible to do this query WITHOUT using a subselect?

tables

• user:
• id
• name

value_type_1

• id
• user_id
• value

value_type_2

• id
• user_id
• value

I would like a sql query that would return:

id | name | Count(value_type_1) | Count(value_type_2)
1    foo     5                     2
2    bar     3                     7
n    etc..   x                     y

Answer 1

Yes.

You can use a join

select user.id, user.name, count(distinct value_type_1.id),count(distinct value_type_2.id)
from user
   left join value_type_1 on user.id = value_type_1.user_id
   left join value_type_2 on user.id = value_type_2.user_id
group by user.id, user.name