(Continued from previous part...)

68. Which date function returns number value?

months_between

69. Any three PL/SQL Exceptions?

Too_many_rows, No_Data_Found, Value_Error, Zero_Error, Others

70. What are PL/SQL Cursor Exceptions?

Cursor_Already_Open, Invalid_Cursor

71. Other way to replace query result null value with a text

SQL> Set NULL ?N/A?
to reset SQL> Set NULL ??

72. What are the more common pseudo-columns?

SYSDATE, USER , UID, CURVAL, NEXTVAL, ROWID, ROWNUM

73. What is the output of SIGN function?

1 for positive value,
0 for Zero,
-1 for Negative value.

74. What is the maximum number of triggers, can apply to a single table?

12 triggers.

75. What is a database instance? Explain.

A database instance (Server) is a set of memory structure and background processes that access a set of database files. The processes can be shared by all of the users.
The memory structure that is used to store the most queried data from database. This helps up to improve database performance by decreasing the amount of I/O performed against data file.

76. What is Parallel Server?

Multiple instances accessing the same database (only in multi-CPU environments)

(Continued on next part...)