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  Oracle Tips by Burleson

Functions

In this chapter, we are going to introduce Oracle’s data types.  This defines the set of data that can be stored in the Oracle database.  Next, we will introduce Oracle functions, starting with single row functions, date functions and progressing through multi-row functions.  Oracle functions provide an extraordinary capability to manipulate data as it is queried and returned.  

But first, we need to discuss Oracle data types.  Oracle has three basic data types; numbers, characters (or strings), and dates.  Each data type has a different set of functions for manipulation and conversion.

Oracle Data Types

SQL has several standard data types, and we need to match the data types when we start writing SQL.  In this section, we will introduce the set of data types that are part of the Oracle database.  These data types are called basic or built-in data types.  As we will see near the end of this section, you can use these basic data type to create your own data types.

When you create a table, you must define a data type for each column in that table.  For example, here we define a table with a variable character data type (VARCHAR), a date data type and a number data type: 

create table customer
(
   customer_name     varchar(50),
   birth_date        date,
   income            number
);

The basic Oracle data types fall into the following categories: character; number; date; LOBs; and RAW.  The two main character data types are the char and the varchar2.


The above book excerpt is from:

Easy Oracle SQL

Get Started Fast writing SQL Reports with SQL*Plus

ISBN 0-9727513-7-8

Col. John Garmany 

http://www.rampant-books.com/book_2005_1_easy_sql.htm

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