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In Oracle's shared pool, how many memory layers are there? What are they?

Thanks for that information. May I ask another question. If oracle is better than MS Access, what database should I master in looking for a good job in database? Is MS Access have good pay also?

I'm sorry about that! I'm referring to Oracle.

What is the maximum column that we could use? And also what is the maximum foreign key in just one table?

Thanks for the reply.

So for example, the name of the first table is ABC, then the new table is DEF. The syntax would be:

create table target DEF as (select * from ABC);

Am I correct?

What the differences of these two databases? Which one is better to use?

Which clause is better to use in subqueries of SQL, IN or EXISTS clause? Do they have the same output?

How could I create a new table by copying another table's structure?

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In SQL, do all these operators do the same thing? Please explain your answer.