Hi all,
I'm having a trouble with H2 getting stuck on a sub-query. If I do
the following, it returns very quickly with my results:
select customer_id from training.ratings where book_id in
( select book_id from training.ratings where customer_id = 5 )
order by customer_id
However if I embed this query into another query, it hangs:
select customer_id from
( select customer_id from training.ratings where book_id in
( select book_id from training.ratings where customer_id= 5 )
order by customer_id
)
My tables are created with the following:
create schema training
create table training.customers (id int primary key);
create table training.books (id int primary key, name varchar,
date date);
create table training.ratings (customer_id int not null, book_id int
not null, date date not null, rating real, primary key (customer_id,
book_id));
Any help appreciated, thanks.
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