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create table users (id int); insert into users values(1), (2), (3), (4); create table transactions (userid int, transaction_id int, productid int); insert into transactions values (1, 1, 999), (1, 1, 897), (2, 1, 989), (3, 1, 989), (4, 1, 897), (4, 1, 897); create table products (id int, type varchar(10)); insert into products values (999, 'Sports'), (989, 'Fashion'), (789, 'Fashion'), (897, 'Sports');
select u.id, sum(p.type = 'Sports') sports, sum(p.type = 'Fashion') fashion from users u inner join transactions t on t.userid = u.id inner join products p on p.id = t.productid group by u.id
id
sports
fashion
1
2
0
2
0
1
3
0
1
4
2
0