Constants are compared using blank-padded comparison semantics, so the trailing spaces won't affect the result. : CHAR « PL SQL Data Types « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » PL SQL Data Types » CHAR

21. 2. 4. Constants are compared using blank-padded comparison semantics, so the trailing spaces won't affect the result.


SQL>

SQL> SET ECHO ON

SQL> SET SERVEROUTPUT ON

SQL> DECLARE

  2    fixed_length_10  CHAR(10);

  3    fixed_length_20  CHAR(20);

  4    var_length_10    VARCHAR2(10);

  5    var_length_20    VARCHAR2(20);

  6  BEGIN

  7    

  8    

  9    IF 'AAAA' = 'AAAA          ' THEN

 10      DBMS_OUTPUT.PUT_LINE

 11      ('Constant: ''AAAA'' = ''AAAA          ''');

 12    END IF;

 13

 14  END;

 15  /

Constant: 'AAAA' = 'AAAA          '



PL/SQL procedure successfully completed.



SQL>

21. 2. CHAR
	21. 2. 1.	CHAR
	21. 2. 2.	CHAR type variable
	21. 2. 3.	Compare CHAR and VARVHAR32 variables for equality
	21. 2. 4.	Constants are compared using blank-padded comparison semantics, so the trailing spaces won't affect the result.
	21. 2. 5.	Fixed length strings are compared with blank-padded comparison semantic
	21. 2. 6.	Compare fixed length string and a literal
	21. 2. 7.	Compare char against varchar, and the trailing spaces do matter.
	21. 2. 8.	Assigning an empty string to the character variable is exactly the same as assigning NULL to it.

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