What is the maximum no. of columns a table can have ? -oracle

Can Long/Long RAW be clustered ?
No.

Can null keys be entered in cluster index, normal index ?
Yes.

Can Check constraint be used for self referential integrity ? How ?
Yes. In the CHECK condition for a column of a table, we can reference some other column of the same table and thus enforce self referential integrity.

What are the min. extents allocated to a rollback extent ?
Two

What are the states of a rollback segment ? What is the difference between partly available and needs recovery ?
The various states of a rollback segment are :
ONLINE, OFFLINE, PARTLY AVAILABLE, NEEDS RECOVERY and INVALID.

What is the difference between unique key and primary key ?
Unique key can be null; Primary key cannot be null.

An insert statement followed by a create table statement followed by rollback ? Will the rows be inserted ?
No.

an you define multiple savepoints ?
Yes.

Can you Rollback to any savepoint ?
Yes.

What is the maximum no. of columns a table can have ?
254.