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Oracle9i program with pl/sql Sample Questions:

1. Given a function CALCTAX:
CREATE OR REPLACE FUNCTION calctax (sal NUMBER) RETURN NUMBER
IS
BEGIN
RETURN (sal * 0.05);
END;
If you want to run the above function from the SQL *Plus prompt, which statement is true?

A) You need to execute the command CALCTAX(1000);.
B) You need to create a SQL *Plus environment variable X and issue the command EXECUTE :X := CALCTAX(1000);
C) You need to execute the command EXECUTE FUNCTION calctax;.
D) You need to create a SQL *Plus environment variable X and issue the command EXECUTE :X := CALCTAX;
E) You need to create a SQL *Plus environment variable X and issue the command :X := CALCTAX(1000);.

2. What is true about stored procedures?

A) A stored procedure is named PL/SQL block with at least one parameter declaration in the procedure specification.
B) A stored procedure uses the DELCLARE keyword in the procedure specification to declare formal parameters.
C) A stored procedure must have at least one executable statement in the procedure body.
D) A stored procedure uses the DECLARE keyword in the procedure body to declare formal parameters.

3. The add_player, upd_player_stat, and upd_pitcher_stat procedures are grouped together in a package. A variable must be shared among only these procedures.
Where should you declare this variable?

A) In each procedure's DECLARE section, using the exact same name in each.
B) In a database trigger.
C) In the package specification.
D) In the package body.

4. To be callable from a SQL expression, a user-defined function must do what?

A) Be stored only in the database.
B) Return a BOOLEAN or VARCHAR2 data type.
C) Have both IN and OUT parameters.
D) Use the positional notation for parameters.

5. Examine this code:
CREATE OR REPLACE PACKAGE metric_converter
IS
c_height CONSTRAINT NUMBER := 2.54;
c_weight CONSTRAINT NUMBER := .454;
FUNCTION calc_height (p_height_in_inches NUMBER)
RETURN NUMBER;
FUNCTION calc_weight (p_weight_in_pounds NUMBER)
RETURN NUMBER;
END;
/
CREATE OR REPLACE PACKAGE BODY metric_converter
IS
FUNCTION calc_height (p_height_in_inches NUMBER)
RETURN NUMBER
IS
BEGIN
RETURN p_height_in_inches * c_height;
END calc_height;
FUNCTION calc_weight (p_weight_in_pounds NUMBER)
RETURN NUMBER
IS
BEGIN
RETURN p_weight_in_pounds * c_weight
END calc_weight
END metric_converter;
/
CREATE OR REPLACE FUNCTION calc_height (p_height_in_inches NUMBER)
RETURN NUMBER
IS
BEGIN
RETURN p_height_in_inches * metric_converter.c_height;
END calc_height;
/
Which statement is true?

A) The stand alone function CALC_HEIGHT cannot be created because its name is used in a packaged function.
B) If you remove the package body, then the package specification is removed.
C) If you remove the package specification, then the package body and the stand alone stored function CALC_HEIGHT are removed.
D) If you remove the package specification, then the package body is removed.
E) If you remove the stand alone stored function CALC_HEIGHT, then the METRIC_CONVERTER package body and the package specification are removed.
F) If you remove the package body, then the package specification and the stand alone stored function CALC_HEIGHT are removed.

Solutions: