《MysqL学习MysqL多表子查询与左连接的代码》要点：
本文介绍了MysqL学习MysqL多表子查询与左连接的代码，希望对您有用。如果有疑问，可以联系我们。
MysqL应用需求：
如何在MysqL中实现复杂查询、多表查询包含子连接的?
select c.*,d2.hasorders from dw_customerinfo c left join (select d.customerid,sum(d.price)>sum(d.pay) debt from dw_ordersdetail d where d.state='1' and d.pubtime<= now() group by d.customerid) d1 on c.id=d1.customerid
left join (select d.customerid,count(d.customerid)>0 hasorders from dw_ordersdetail d group by d.customerid) d2 on c.id=d2.customerid
left join (select d.customerid,count(d.customerid)>0 hasorders from dw_ordersdetail d group by d.customerid) d2 on c.id=d2.customerid
Select * FROM t1 LEFT JOIN (t2,t3,t4) ON (t2.a=t1.a AND t3.b=t1.b AND t4.c=t1.c)
SELECT artists.Artist,cds.title,genres.genre
FROM cds
LEFT JOIN genres N cds.genreID = genres.genreID
LEFT JOIN artists ON cds.artistID = artists.artistID;
FROM cds
LEFT JOIN genres N cds.genreID = genres.genreID
LEFT JOIN artists ON cds.artistID = artists.artistID;