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Oracle Tables and DML

In this chapter, we are going to discuss Oracle database tables; how to create and manage them. Tables are the bases for a relational database.  Other database objects will be introduced in Chapter 5. 

Once we have an understanding of Oracle tables and how data is stored in them, we are ready to move to manipulating the data.   So far, we have just pulled information from the database.  How did that data get there, and how can we change the data already in the database?  This is the function of the INSERT, UPDATE and DELETE  statements.  Together, they are referred to as data manipulation language  (DML).


DML changes data in an object.  If you insert a row into a table, that is DML.  You have manipulated the data.  When you create, change or remove a database object, it is referred to as data definition language (DDL).  As we will discuss at the end of this chapter, all DDL statements issue an implicit commit, so they are a permanent change.  All DML statements change data and must be committed before the change becomes permanent.

The above text is an excerpt from:

Easy Oracle SQL
Get Started Fast Writing SQL Reports with SQL*Plus

ISBN 0-9727513-7-8

by John Garmany

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