What are the pseudo columns in Oracle?
A Pesudo column is not actual column of any database table, it
only behave like a table column and you can select pesudo column
values for a table but you can not perform insert, update or delete
for a pseudocolumn. Oracle supporting many pseudo columns, some of
those are :
CURRVAL NEXTVAL LEVEL ROWID ROWNUM ORA_ROWSCN
OBJECT_ID
For
more details visit to Oracle.com :

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