Objectives After completing this lesson, you should be able to do the following: •List the capabilities of SQL SELECT statements •Execute a basic SELECT statement •Differentiate between SQL statements and SQL*Plus commands Lesson Aim To extract data from the database. you need to . Ordered Results ¨SQL query results can be ordered by particular attributes ¨Two main categories of query results: ¤“Not ordered by anything” nTuples can appear in anyorder ¤“Ordered by attributes A 1, A 2, ” nTuples are sorted by specified attributes nResults are sorted by A 1first nWithin each value of A 1, results are sorted by A 2 netc. ¨Specify an ORDER BYclause at end of. Basic SQL SQL language Considered one of the major reasons for the commercial success of relational databases SQL Structured Query Language Statements for data definitions, queries, and updates (both DDL and DML) Core specification Plus specialized extensions.
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