Item 59 of 63 Mark item for review  

The SAS data set WORK.TEST has an index

on the variable Id and the following SAS     

program is submitted.

data WORK.TEST;

     set WORK.TEST(     

        keep=Id Var_1 Var_2     

        rename=(Id=Id_Code));   

     Total=sum(Var_1, Var_2);   

run;

Which describes the result of

submitting the SAS program?   

        A.

The index on Id is deleted.     

     B.

The index on Id is updated as an index onId_Code.

     C.

The index on Id is deleted and an index onId_Code is created.   

     D.

The index on Id is recreated as an index onId_Code.      

答案是a，但是这个sas的网页上面说的是index is renamed,谁来帮我解释一下呀，谢谢

Maintenance Tasks and Index Results

Task

Result

delete a data set

index file is deleted

rename a data set

index file is renamed

rename key variable

simple index is renamed

delete key variable

simple index is deleted

add observation

index entries are added

delete observations

index entries are deleted and space is recovered for reuse

update observations

index entries are deleted and new ones are inserted

http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#a000440261.htm