PL/SQL Fundamentals Exercises: PL/SQL block to create procedure and call it for AND operator

PL/SQL Fundamentals: Exercise-12 with Solution

Write a PL/SQL block to create a procedure using the "IS [NOT] NULL Operator" and show AND operator returns TRUE if and only if both operands are TRUE.

Here is the procedure :

PL/SQL Code:

CREATE OR REPLACE PROCEDURE pri_bool(
  boo_name   VARCHAR2,
  boo_val    BOOLEAN
) IS
BEGIN
  IF boo_val IS NULL THEN
    DBMS_OUTPUT.PUT_LINE( boo_name || ' = NULL');
  ELSIF boo_val = TRUE THEN
    DBMS_OUTPUT.PUT_LINE( boo_name || ' = TRUE');
  ELSE
    DBMS_OUTPUT.PUT_LINE( boo_name || ' = FALSE');
  END IF;
END;
/

Now call the procedure pri_bool:

PL/SQL Code:

DECLARE
  PROCEDURE pri_m_and_n (
    m  BOOLEAN,
    n  BOOLEAN
  ) IS
  BEGIN
   pri_bool ('m', m);
   pri_bool ('n', n);
   pri_bool ('m AND n', m AND n);
 END pri_m_and_n;
 
BEGIN
DBMS_OUTPUT.PUT_LINE('------------- FOR m and n both FALSE ---------------------');
 pri_m_and_n (FALSE, FALSE);
DBMS_OUTPUT.PUT_LINE('------------- FOR m TRUE AND n FALSE ---------------------');
 pri_m_and_n (TRUE, FALSE);
DBMS_OUTPUT.PUT_LINE('------------- FOR m FALSE AND n TRUE ---------------------');
 pri_m_and_n (FALSE, TRUE);
DBMS_OUTPUT.PUT_LINE('------------- FOR m TRUE AND n TRUE ---------------------');
 pri_m_and_n (TRUE, TRUE);
DBMS_OUTPUT.PUT_LINE('------------- FOR m TRUE AND n NULL ---------------------');
 pri_m_and_n (TRUE, NULL);
DBMS_OUTPUT.PUT_LINE('------------- FOR m FALSE AND n NULL---------------------');
 pri_m_and_n (FALSE, NULL);
DBMS_OUTPUT.PUT_LINE('------------- FOR m NULL AND n TRUE ---------------------');
 pri_m_and_n (NULL, TRUE);
DBMS_OUTPUT.PUT_LINE('------------- FOR m NULL AND n FALSE ---------------------');
 pri_m_and_n (NULL, FALSE);
END;
/

Sample Output:

------------- FOR m and n both FALSE ---------------------
m = FALSE
n = FALSE
m AND n = FALSE
------------- FOR m TRUE AND n FALSE ---------------------
m = TRUE
n = FALSE
m AND n = FALSE
------------- FOR m FALSE AND n TRUE ---------------------
m = FALSE
n = TRUE
m AND n = FALSE
------------- FOR m TRUE AND n TRUE ---------------------
m = TRUE
n = TRUE
m AND n = TRUE
------------- FOR m TRUE AND n NULL ---------------------
m = TRUE
n = NULL
m AND n = NULL
------------- FOR m FALSE AND n NULL---------------------
m = FALSE
n = NULL
m AND n = FALSE
------------- FOR m NULL AND n TRUE ---------------------
m = NULL
n = TRUE
m AND n = NULL
------------- FOR m NULL AND n FALSE ---------------------
m = NULL
n = FALSE
m AND n = FALSE

Statement processed.

0.00 seconds

Flowchart:

Procedure

Now call the procedure pri_bool:

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