[英]Joining two tables with same column names but with different data abbreviations
[英]SQL joining two tables with the same column names
我有两个具有完全相同列名的数据集。
但是,当我运行以下代码时,
proc sql;
create table diff as
select a.fish, b.fish
from newmonth as a
left join previousmonth as b
on a.pond = b.pond;
quit;
它只返回一个包含一列的表,即鱼。 但是,我想要两列,a.fish 和 b.fish。
我不想使用 select a.fish as ,因为我有大约 50 种不同的动物我想要 select 并且不想每次都手动输入。
SQL 有没有办法根据它来自哪个表自动 label 列?
谢谢,
请尝试以下查询并检查结果:
proc sql;
create table diff as
select *
from newmonth as a
left join previousmonth as b
on a.pond = b.pond;
quit;
给他们不同的名字:
create table diff as
select a.fish as a_fish, b.fish as b_fish
from newmonth a left join
previousmonth b
on a.pond = b.pond;
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