topic Re: Delete a table from cas library in SAS Viya for Learners in SAS Data Management

Delete a table from cas library in SAS Viya for Learners

andreas_zaras — Sat, 24 Jul 2021 17:47:07 GMT

Hello,

I have created a data set in the academic cas library in SAS Viya for learners using a data step (i also promoted it). I want to replace the data set with a new one. How can i delete it from the academic cas?

Thanks in advance,

Andreas

Re: Delete a table from cas library in SAS Viya for Learners

HarrySnart — Mon, 26 Jul 2021 08:37:55 GMT

Hi @andreas_zaras

With regards to how to delete a table from a CAS library, I'd recommend you look at PROC CASUTIL, specifically the DROPTABLE function. https://go.documentation.sas.com/doc/en/vdmmlcdc/1.0/casref/p14fpceaxx8pz9n1id0wrgj92mrt.htm

When a table is promoted in CAS it is a global scope table, CAS does not allow you to implicitly replace the dataset to protect the dataset. That said, if you need to replace the data all you need to do is add the REPLACE option.

Here is some simple example code:

*Add CASLIB to session;
libname casuser cas;

*Load data into CAS;
data casuser.cars(promote=yes);
set sashelp.cars;
run;

*Replace data using datastep;
data casuser.cars(replace=yes);
set sashelp.cars(where=(make='Audi'));
run;

*Drop table using PROC CASUTIL;
proc casutil;
droptable casdata='cars' incaslib='casuser';
run;

*Test table does not exist;
proc print data=casuser.cars;run;

Hope this helps

Thanks,

Harry

Re: Delete a table from cas library in SAS Viya for Learners

andreas_zaras — Fri, 13 Aug 2021 18:08:25 GMT

Thanks for your answer! It works fine i used both replace and promote at the same time and everyting is fine,

Thanks!

Re: Delete a table from cas library in SAS Viya for Learners

MAGG — Fri, 26 Aug 2022 11:10:19 GMT

Unfortunately there seem a misunderstanding in the given example.

The proc print works fine en does not give an error at all!

This is because the second cars-table is a not a global-scope cas-table but a session-scope cas-table! The cas-table is therefore not replaced. The drop-table statement drops the session-scope table. The unalterd global-scope table still exists!!