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Reg:Droping variables

Posts: 66

Reg:Droping variables

i am having a huge dataset with 200gb and having 100 variable ,now i want to drop 1 variable unused_trans,

i can do by this way

data tran_data(drop=unused_trans);

set tran_data;


is there any other way to drop the variable by using proc datasets or proc sql with out recreating the dataset

Super User
Posts: 10,761

Reg:Droping variables

It looks like you can't do it without recreating a new table ,even SQL.

But If you like view you can create a view for that which is most fast and most saving disk space method.

Frequent Contributor
Posts: 139

Reg:Droping variables

I don;t think there is any other way accept creating a view.

Super User
Posts: 6,751

Reg:Droping variables

It would be slightly faster to do it this way:

data tran_data;

    set tran_data (drop=unused_trans);


Super User
Posts: 5,876

Reg:Droping variables

As already said, SAS offers no support of modifying table structure in place.

If this is a rare operation, I can't see any problem by recreating the table.

if you often need to add/drop columns, and performance is an issue, you might want to look for other storage options.

If you are eager to save disk space, you may want to look at compression (SAS or host based).

If you just want to hide some obsolete columns for your users, using views, information maps or metadata rights could be an alternative.

Data never sleeps
Super User
Posts: 13,498

Reg:Droping variables

How does it get in the data in the first place? Just about any approach should allow a (drop=variable) from the output when creating the SAS dataset. it from the datastep would be a better approach as you're going to need rought 400gb of disk to process.

Super User
Posts: 23,662

Reg:Droping variables

Where is your data stored?

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