Answer Posted / gopi

1) rename can be used as statement or dataset option to
change the name of variable.
2) label, if used as a statement it changes or assigns label
to a variable and if used as a dataset option it changes or
assigns label to the dataset.

Reaname:

a) If you use rename data set option for input dataset, then
SAS renames the variable name in Input dataset.

Data new;
x=1;
y=2;
run;

Data ren ;
set new(rename=(x=z));
run;
This will create ren dataset with z and y variables, and you
can use z varible in the same data step if you want to do
any calculations.


b) If you use rename data set option for output dataset,
then SAS renames the variable in output dataset.
Data new;
x=1;
y=2;
run;

Data ren (rename=(x=z));
set new;
run;
This will create ren dataset with z and y variables, and you
can not use z varible in the same data step if you want to
do any calculations.



3)You can use Rename as statement also, in which case it
effects only output dataset. i.e you can not use the renamed
variable in same data step in calculations

Label:
a) If you use label statement in data step, it assigns or
changes the label name for a variable permanently.
b) If you use label statement in proc step, it assigns or
changes the lable name for a variable temporarily for that
proc step.
c) If you use label as dataset option it assigns label to
the dataset, but not the variable.

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