April 1999
Intermediate to advanced
584 pages
23h 17m
English
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Simple Queries
The simplest of the queries is the simple query, or a query against one table. An example is:
SELECT ename,deptno FROM emp;
Minimal effort is required to determine how to process this query. In this case, Oracle performs what is called a full table scan; that is, Oracle reads every row in the table from disk.
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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.