Question

The code is:

DELIMITER $$
CREATE FUNCTION CHECK_AVABILITY(nama CHAR(30))
RETURNS INT(4)
DECLARE vreturn INT(4);
BEGIN
IF nama = 'ika' THEN
SET vreturn = 0;
ELSE
SET vreturn = 1;
END IF
RETURN vreturn;
END $$

The error message is:

ERROR 1064 (42000): You Have an error inyour sql syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘DECLARE vreturn INT4); BEGIN’

Help is appreciated.

Answer 1

Move DECLARE vreturn INT(4) inside the BEGIN / END block. You probably also need a ; after the END IF.
Additionally, this looks like it is to be a DETERMINISTIC function. Add the DETERMINISTIC keyword before the BEGIN.

DELIMITER $$
CREATE FUNCTION CHECK_AVABILITY(nama CHAR(30))
RETURNS INT(4)
DETERMINISTIC
BEGIN
  DECLARE vreturn INT(4);
  IF nama = 'ika' THEN
    SET vreturn = 0;
  ELSE
    SET vreturn = 1;
  END IF;
  RETURN vreturn;
END $$