Answer Posted / pradeep

http://download.oracle.com/docs/cd/B19306_01/server.102/b142
00/queries007.htm

The below stated on above page from oracle

A subquery can contain another subquery. Oracle Database
imposes no limit on the number of subquery levels in the
FROM clause of the top-level query. You can nest up to 255
levels of subqueries in the WHERE clause.

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