六、SQL 多张表数据叠加到一个视图里面

1 create view vABC as
select * from a,b,c
where a.id = b.aid and b.id = c.bid

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2 CREATE VIEW VABC AS

SELECT * FROM A

LEFT JOIN B ON A.ID=B.AID

LEFT JOIN C ON B.ID=C.BID

WHERE A.ID=##;