后端开发|php教程
bookid,join,bookcase,from,borr
后端开发-php教程
请帮忙解释一下，多表联查，我看太不懂，，谢啦
SQL code
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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
请帮忙解释一下，多表联查，我看太不懂，，谢啦
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SQL code
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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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