part.database.xml

<?xml version="1.0" encoding="UTF-8"?>
<part id="database">
	<title>Database Relational</title>
	<screen>
What are the difference between DDL, DML and DCL commands?
DDL is Data Definition Language statements. Some examples:
CREATE - to create objects in the database
ALTER - alters the structure of the database
DROP - delete objects from the database
TRUNCATE - remove all records from a table, including all spaces allocated for

the records are removed
COMMENT - add comments to the data dictionary
GRANT - gives user's access privileges to database
REVOKE - withdraw access privileges given with the GRANT command


DML is Data Manipulation Language statements. Some examples:
SELECT - retrieve data from the a database
INSERT - insert data into a table
UPDATE - updates existing data within a table
DELETE - deletes all records from a table, the space for the records remain
CALL - call a PL/SQL or Java subprogram
EXPLAIN PLAN - explain access path to data
LOCK TABLE - control concurrency


DCL is Data Control Language statements. Some examples:
COMMIT - save work done
SAVEPOINT - identify a point in a transaction to which you can later roll back
ROLLBACK - restore database to original since the last COMMIT
SET TRANSACTION - Change transaction options like what rollback segment to use
	</screen>
<chapter id="db.engines">
	<title>DB-Engines - DB-Engines Ranking</title>
	<para><ulink url="http://db-engines.com/en/ranking" /></para>
</chapter>
	&chapter.test.xml;
	&chapter.etl.xml;
	&chapter.migration.xml;
	&chapter.greensql.xml;
<chapter id="db.design">
	<title>Database design &amp; E-R diagram</title>
	<section id="dbdesigner">
		<title>opensource database design tools</title>
		<para>DBDesigner 4 - http://www.fabforce.net/dbdesigner4/</para>
	</section>
	<section id="codebydesign">
		<title>OpenSystemArchitect</title>
		<para>http://www.codebydesign.com</para>
	</section>
	<section id="sqlpower">
		<title>SQL Power Architect</title>
		<para>http://www.sqlpower.ca/</para>
	</section>
</chapter>

</part>