Re: formulate nested select

PJ wrote:

I cannot find anything on google or the manuals/tutorials that gives some kin of clear explanation of how to so nested selects with where or whatever. I have three tables: books, authors and book-authors. I need to retrieve only those books whose author's names begin with A. I have tried several maniipulations of where and select with select subqueries and I cannot get results from the queries. For example "SELECT * FROM book b, book_authors c (SELECT id FROM author WHERE LEFT(author.last_name = $Auth )) as a WHERE a.id = c.authID && b.id = c.bookID ....<snip>

Not really a php question :P You don't need a subquery for this. You can join all of the tables together and just use the where clause to cut down your results, but I'll give an example of both. select * from books b inner join book_authors c on (b.id=c.bookId) inner join authors a on (a.id=c.authorId) where left(a.last_name = 'A'); or select * from books b inner join book_authors c on (b.id=c.bookId) where c.authorId in (

    select id from authors where left(last_name='A')

); -- Postgresql & php tutorials http://www.designmagick.com/