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create table if not exists "user" ( "id" serial primary key, "name" text ); create table if not exists "post" ( "id" serial primary key, "title" text, "user_id" int not null, foreign key(user_id) references "user" (id) ); insert into "user" ( "id","name" ) values ( 1,'JohnDoe' ); insert into "post" ( "id","title","user_id" ) values ( 1,'first post',1 ), ( 2,'second post',1 ); select id, name, ( select to_json(array_agg("posts"."id")) from ( select "id" from "post" where "post"."user_id" = 1 ) posts ) posts_ids from "user";
1 rows affected
2 rows affected
id
name
posts_ids
1
JohnDoe
[1,2]