December 2014
Intermediate to advanced
858 pages
40h 10m
English
Content preview from SAS Certification Prep Guide, 4th Edition
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Chapter 23: Querying Data Efficiently
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Correct answer: dWhen using an index to select a subset, SAS loads only the pages that contain at least one qualified observation into input buffers. When accessing observations sequentially, SAS must load all pages into input buffers. Loading more pages requires more I/O operations.
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Correct answer: bSAS does not use an index for a WHERE condition that contains a function other than TRIM or SUBSTR.
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Correct answer: aThe size of the subset relative to the size of the data set is an important factor in determining which access method is most efficient. If a subset is large (more than 33% of the data set), it is likely to be more efficient to use sequential access than direct access. Direct ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.