PROC SQL question

monu101 — Wed, 17 Jan 2018 15:52:08 GMT

Given the following SQL procedure output:
Table Physical Obs % Deleted
EMPLOYEE_ADDRESSES 424 5.0%
EMPLOYEE_PAYROLL 424 5.0%

Which SQL query will produce a report for tables in the ORION library which have had at least 5% of
their physical rows deleted, as shown above?

A. select MEMNAME 'Table', NOBS 'Physical Obs', DELOBS/NOBS '% Deleted' format=percent6.1
from dictionary.tables
where LIBNAME='ORION' AND DELOBS/NOBS >= .05;
B. select Table_Name, Num_Rows 'Physical Obs', Deleted_Rows/Num_Rows '% Deleted' format=percent6.1
from dictionary.DBA_TABLES
where TABLESPACE_NAME='ORION' AND Deleted_Rows/Num_Rows >= .05;
C. select MEMNAME 'Table', NLOBS 'Physical Obs', DELOBS/NLOBS LABEL='% Deleted' format=percent6.1
from dictionary.tables
where LIBNAME='ORION' AND DELOBS/NLOBS >= .05;

D. select MEMNAME 'Table', NOBS 'Physical Obs', DELOBS/NOBS LABEL='% Deleted' format=percent6.1
from dictionary.members
where LIBNAME='ORION' AND DELOBS/NOBS >= .05;

correct_answer = "A"

Why the choice "C" is wrong? To me it looks like both the choices "A" and "C" are correct. Can someone please explain why the choice "C" is incorrect.

Re: PROC SQL question

Astounding — Wed, 17 Jan 2018 16:50:14 GMT

The L in NLOBS means "logical". That's how many observations are logically in the data set. The value includes all observations minus the number of deleted observations.

That would be the wrong denominator to use for computing percentages.

Re: PROC SQL question

monu101 — Wed, 17 Jan 2018 17:55:26 GMT

Thank you for answering the question.

I haven't noticed L in NLOBS and reading it as NOBS. Thought there might be some mistake with LABEL which I am not able to figure out.

Anyways, got it now. Thanks Again!

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