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Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts
book

Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

by John Adolph Palinski
August 2002
Intermediate to advanced content levelIntermediate to advanced
528 pages
10h 12m
English
Addison-Wesley Professional
Content preview from Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

Ordering Records

The ORDER BY clause is used to change the order records that the SELECT statement displays. This clause tells Oracle which columns determine the record order. Column or expression names placed after the ORDER BY keywords determine the order. A comma is used to separate the names.

This clause is always the last clause in the SELECT statement because the ordering is performed on the selected records after they are placed in memory. The other clauses tell Oracle what to retrieve from the database. After the values are retrieved, the ordering occurs.

Listing 4.20 illustrates a SELECT statement that contains an ORDER BY clause. The clause orders the employees in the POL department by last name.

Listing 4.20. Ordering the Retrieved ...
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Publisher Resources

ISBN: 0201752948Purchase book