Modifying @Richard's code I would do:
filename csv 'c:\tmp\abc.csv';
data _null_;
file csv;
put 'a,b,c,d';
put '1,2,,';
put '2,3,,';
put '3,4,,';
run;
proc import datafile=csv dbms=csv replace out=have;
getnames=yes;
run;
Go to the LOG window and see SAS code produced by PROC IMPORT:
data WORK.HAVE ;
%let _EFIERR_ = 0; /* set the ERROR detection macro variable */
infile CSV delimiter = ',' MISSOVER DSD lrecl=32767 firstobs=2 ;
informat a best32. ;
informat b best32. ;
informat c $1. ;
informat d $1. ;
format a best12. ;
format b best12. ;
format c $1. ;
format d $1. ;
input
a
b
c $
d $
;
if _ERROR_ then call symputx('_EFIERR_',1); /* set ERROR detection macro variable */
run;
Run this code and see that two last columns imported as characters.
Check it:
ods select Variables;
proc contents data=have nodetails;run;
Possible to modify this code and load required columns as numeric. I would not drop and add columns in SQL because this columns could have data somewhere.
Modified import code:
data WORK.HAVE ;
%let _EFIERR_ = 0; /* set the ERROR detection macro variable */
infile CSV delimiter = ',' MISSOVER DSD lrecl=32767 firstobs=2 ;
informat a best32. ;
informat b best32. ;
informat c best32;
informat d best32;
format a best12. ;
format b best12. ;
format c best12;
format d best12;
input
a
b
c
d
;
if _ERROR_ then call symputx('_EFIERR_',1); /* set ERROR detection macro variable */
run;
Check table description:
ods select Variables;
proc contents data=have nodetails;run;
.
in the first row where the,,
are. Change them to,.,
– Richard