sql 整理积累

1 SELECT * from (SELECT * FROM dbo.xcqy2017_Article WHERE Kind=53) AS t1 
2 LEFT JOIN (SELECT * FROM dbo.xcqy2017_News_Classification) AS t2 ON t2.Ncid = t1.Ncid

left join左链接 以左表为主表

1 SELECT * from (SELECT * FROM dbo.xcqy2017_Article WHERE Kind=53) AS t1 
2 RIGHT JOIN (SELECT * FROM dbo.xcqy2017_News_Classification) AS t2 ON t2.Ncid = t1.Ncid

right join右链接 以右表为主表