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ORACLE Interview Questions and Answers
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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
628. How many columns can table have?
The number of columns in a table can range from 1 to 254.
629. Is space acquired in blocks or extents ?
In extents .
630. what is clustered index?
In an indexed cluster, rows are stored together based on their cluster key values .
Can not applied for HASH.
631. what are the datatypes supported By oracle (INTERNAL)?
Varchar2, Number,Char , MLSLABEL.
632. What are attributes of cursor?
%FOUND , %NOTFOUND , %ISOPEN,%ROWCOUNT
633. Can you use select in FROM clause of SQL select ?
Yes.
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