December 2014
Intermediate to advanced
858 pages
40h 10m
English
Content preview from SAS Certification Prep Guide, 4th Edition
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Understanding Indexes
Accessing Rows in a Table
When
you submit a query on a table that does not have an index, PROC SQL
accesses rows sequentially, in the order in which they are stored
in the table. For example, suppose you are working with a table that
contains information about employees. You have written a PROC SQL
query to select the rows in which the value of Name (the first column)
is
Smith. To access the rows that you
want, PROC SQL begins with the first row and reads through all rows
in the table, selecting the rows that satisfy the condition that is
expressed in the WHERE clause.
When you execute a program that retrieves a small ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.