Hello everyone,
I have a question regarding a left join. I have two tables which look like this:
table1:
ID | info1 | info2 |
1 | xyz | 10 |
2 | abc | 20 |
3 | def | 30 |
4 | ghi | 40 |
table2:
ID | info3 |
1 | A |
1 | A |
2 | C |
2 | C |
2 | C |
3 | A |
3 | A |
4 | F |
4 | F |
4 | F |
I now want to join the information from table 2 to my first table but I would only need info3 once so that my final table looks like this:
desired table:
ID | info1 | info2 | info3 |
1 | xyz | 10 | A |
2 | abc | 20 | C |
3 | def | 30 | A |
4 | ghi | 40 | F |
By simply coding this:
proc sql;
create table test as
select a.*, b.info3
from table1 as a
left join table2 as b
on a.ID=b.ID;
quit;
I get several duplicate rows. I guess I have to distinct the join somewhere, but I am not sure how.
Thank you for your help.
Hi @Jay_Aguilar
Try this:
proc sql;
create table test as
select a.*, b.info3
from table1 as a
left join
(select distinct * from table2) as b
on a.ID=b.ID;
quit;
Best,
Hi @Jay_Aguilar
Try this:
proc sql;
create table test as
select a.*, b.info3
from table1 as a
left join
(select distinct * from table2) as b
on a.ID=b.ID;
quit;
Best,
Thank you very much for your help!!
You're welcome @Jay_Aguilar 😊
Registration is open! SAS is returning to Vegas for an AI and analytics experience like no other! Whether you're an executive, manager, end user or SAS partner, SAS Innovate is designed for everyone on your team. Register for just $495 by 12/31/2023.
If you are interested in speaking, there is still time to submit a session idea. More details are posted on the website.
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.