Question

With MySQL, how can i query a column from the table at 3 level depth?

I mean:
[main table] —> [child table 1] —> [child table 2]
> C#1's ID ——– > C#2's ID ———— > String Column

For example:

[transaction]
– id
– bookid *
– date
– staff

[book]
– id
– authorid *
– title

[author]
– id
– name

By knowing only transaction.id, so how can i query for a result including following columns?
.. transaction.date , book.title , author.name ..

Answer 1

select t.date,b.title,a.name from book b  
innerjoin transaction t on t.bookid = b.id 
innerjoin author a on b.authorid = a.id