请帮忙解释一下，多表联查，小弟我看太不懂，谢啦

请帮忙解释一下，多表联查，我看太不懂，，谢啦

SQL code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->select * from (select bookid,count(bookid) as degree from tb_borrow group by bookid) as borr join (select b.*,c.name as bookcasename,p.pubname,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b.del=0) as book on borr.bookid=book.id order by borr.degree desc limit 10 

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SQL code

select * from     (        select bookid,count(bookid) as degree from tb_borrow group by bookid    )as borr join       (         select b.*,c.name as bookcasename,p.pubname,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b.del=0      ) as book on borr.bookid=book.id order by borr.degree desc limit 10<div class="clear">
                 
              
              
        
            </div>

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