Effects of nulls on boolean expressions: >, < (2) : Boolean Expression « PL SQL « Oracle PL / SQL

1. Oracle PL / SQL
2. PL SQL
3. Boolean Expression

Effects of nulls on boolean expressions: >, < (2)

 
SQL>
SQL> --  Effects of nulls on boolean expressions.
SQL> SET SERVEROUTPUT ON
SQL>
SQL> DECLARE
  2     a     INTEGER;
  3     n     INTEGER;     -- be our null value.
  4  BEGIN
  5     -- Assign a value to the variable A, but leave N null.
  6     a := 2;
  7     -- But also note that the test for a <> n fails.
  8     IF a <> n THEN
  9       DBMS_OUTPUT.PUT_LINE('a <> n is true');
 10     ELSE
 11       DBMS_OUTPUT.PUT_LINE('a <> n is not true');
 12     END IF;
 13
 14  END;
 15  /
a <> n is not true

PL/SQL procedure successfully completed.

SQL>

           
         
  

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