inner join:只对第一个表和第二个表共有的行匹配结果,若包含重复值,采用笛卡尔交集组合 left join:在inner join的基础上保留,主表的其他观测 right join:在inner join的基础上保留,副表的其他观测,但是非共有的观测行,无法显示匹配变量的值 Full join:显示两个表的全部内容,但是副表里的非共有的观测行,无法...
from where 和inner join +on的作用一致 inner join +on是为了和left/right join on 相统一。 1proc sql;2title'self join';3selecta.gtone,b.shen4frommysas.ifthen1 a,mysas.ifthen1 b5wherea.date=b.date;6quit; 用别名可以实现自身与自身的查询。
from where 和inner join +on的作用一致 inner join +on是为了和left/right join on 相统一。 1proc sql;2title'self join';3selecta.gtone,b.shen4frommysas.ifthen1 a,mysas.ifthen1 b5wherea.date=b.date;6quit; 用别名可以实现自身与自身的查询。
proc sql ; create table Temp1_1 as select distinct a.*,b.BIRTHDAT from ICF as a left join DM as b on a.cn =b.cn and a.dn =b.dn ; quit; Merge If b; data Temp1_2; merge ICF(in=a) DM(in=b); by cn dn; if b ; run; <Proc Sql实现同样的效果> proc sql ; create tabl...
Join、Left Join、Right Join、Full Join、On、 Where区别和用法,不用我说其实前面的这些基本SQL语法...
【sas proc sql】cross/union/natural join 1proc sql;2selecta.a'#a#a sample',b.afrommylearn.outerjoin_a a cross join mylearn.outjoin_b b;3quit; 1. 2. 3. cross join 做两个表的笛卡尔积 ,如果有筛选条件,用where 1proc sql;2selecta.a'#a#a sample',b.afrommylearn.outerjoin_a a ...
from where 和inner join +on的作用一致 inner join +on是为了和left/right join on 相统一。 1proc sql;2title'self join';3selecta.gtone,b.shen4frommysas.ifthen1 a,mysas.ifthen1 b5wherea.date=b.date;6quit; 1. 2. 3. 4. 5.
SAS Code: procsql noprint nowarn;createtableexampleasselectdistinctb.*,a.pt,a.transynfromarightjoinbona.pt=b.pt;quit; 2. Intersection (Inner Join) Suppose we want to produce all the records that contained in both Dataset A and Dataset B ...
简单来说 union是纵向合并两张表,合并后的表更长了 join是横向合并两张表,合并后的表更宽了
PROC SQL; CREATE TABLE black AS SELECT * FROM excel.grey A LEFT JOIN excel.blue B ON A.ID=B.ID ; QUIT; INNER JOIN:在B中保留A中ID所在的观测 LEFT JOIN:在B中保留A中ID所在的观测,并合并到A中 RIGHT JOIN:在A中保留B中ID所在的观测,并合并到B中 FULL JOIN:返回两表匹配和不匹配的数据。