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SQLÁ½±í¼¶Áª²Ù×÷ - MS-SQL Server / Ó¦ÓÃʵÀý

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Á½Õűí
A»õÎï±í(Huowu)
»õÎï±àºÅ(ID) »õÎïÃû³Æ(Name)ÏÈÌṩÕâôÁ½ÁÐ
B²Ö¿â±í(Cangku)
ÎïÆ·±àºÅ(ID),»õÎï±àºÅ(ºÍA±íµÄ»õÎï±àºÅÒ»ÑùHid),ÊÇ·ñÈë¿â(RuÓÃ1,0±íʾ)
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SQL code:
select
a.*,b.ÊÇ·ñÈë¿â
from
huowu a,cangku b
where
a.id=b.hid


SQL code:
select A.*,B.*
from A inner join B
on A.Id=B.Hid
where Ru=1


select a.id ,a.name ,b.ru
from Huowu as a left outer join Cangku as b
on a.ID = b.Hid

SQL code:
select a.*,b.Ru from huowu as a,cangku b where a.ID=b.ID


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B²Ö¿â±í(Cangku)
ÎïÆ·±àºÅ(ID),»õÎï±àºÅ(ºÍA±íµÄ»õÎï±àºÅÒ»ÑùHid),ÊÇ·ñÈë¿â(RuÓÃ1,0±íʾ)
ÎÒÏÖÔÚÏë×öµÄÊÇͨ¹ýSQlÓï¾ä ²éѯ³ö
A±íµÄËùÓÐÊý¾Ý,µ«ÊÇÒªÔÚÿÌõÊý¾ÝºóÃæ¼ÓÉÏÈë¿âÐÅÏ¢.¾ÍÊÇÄǸöÊÇ·ñÈë¿â1,0.
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