Few Questions to be answered please

Major Differences between
1.Oracle 7.2 and Oracle 8i
2.Oracle 8i and Oracle 9i
3.Oracle 9i and 10g
And
What is External Table and Sql * Loader
Why cannot we use a COMMIT statement in a Trigger
If you can provide any good links also is fine..Thank You in advance

2.Oracle 8i and Oracle 9ihttp://www.oracle-base.com/articles/9i/SQLNewFeatures9i.php#Top
3.Oracle 9i and 10g Andhttp://www.oracle-base.com/articles/10g/Articles10g.php#OCP
What is External Table and Sql * Loaderhttp://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14215/ldr_concepts.htm
http://www.oracle-base.com/articles/9i/ExternalTables9i.php#Top
Why cannot we use a COMMIT statement in a Trigger
In very few words:
COMMIT is just end's a transaction. While trigger is being executed the transaction is in it's middle state so it can't be ended.
For more details read the manuals.
Regards

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