What is pseudo columns ? Name them?
ORACLE Interview Questions and Answers (Part 4)
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627. What is pseudo columns ? Name them?
A pseudocolumn behaves like a table column, but is not actually
stored in the table. You can select from pseudocolumns, but you
cannot insert, update, or delete their values. This section
describes these pseudocolumns:
* CURRVAL
* NEXTVAL
* LEVEL
* ROWID
* ROWNUM
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