an error message

[Radwan]

Hello everyone 

I have run the following code 

proc sql; 
create table me AS SELECT a.n_cfo,a.n_prod,a.n_disexp,b.Is_there_any_defect_in_internal,c.Fraud_Dummy
from real as a, defect as b
full join violation as c
on a.code=b.code=c.code and a.year=b.year=c.year;
quit;

but i got the following message

62 proc sql;
63 create table me AS SELECT
63 ! a.n_cfo,a.n_prod,a.n_disexp,b.Is_there_any_defect_in_internal,c.Fraud_Dummy
64 from real as a, defect as b
65 full join violation as c
66 on a.code=b.code=c.code and a.year=b.year=c.year;
ERROR: Correlated reference to column code is not contained within a subquery.
ERROR: Correlated reference to column year is not contained within a subquery.
67 quit;
NOTE: The SAS System stopped processing this step because of errors.
NOTE: PROCEDURE SQL used (Total process time):
real time 0.02 seconds
cpu time 0.03 seconds

###

so i do not know where the error i checked my data very well 

please explain such an error.

[PeterClemmensen · Accepted solution]

I can't see your data, so this is untested, but I think this gives you what you want

proc sql; 
create table me AS SELECT a.n_cfo,a.n_prod,a.n_disexp,b.Is_there_any_defect_in_internal,c.Fraud_Dummy
from real as a, defect as b
where a.code=b.code and a.year=b.year
full join violation as c
on b.code=c.code and b.year=c.year;
quit;

[Radwan]

but this option removes the codes that do not exist in the last file.

for instance: the last file contains 1500 firms code and the rest contain 1900 

so this option ((where) without full join) will eliminate 400 codes