Why my Sql Script does not work? - mysql

Question

I am newbie to MySQL
I am trying to generate random data and put it into table 'data'
But SQL shell says that my sql code have syntax error
But I can't find why
DECLARE #counter smallint;
DECLARE #A BOOLEAN;
DECLARE #B BOOLEAN;
DECLARE #C int(4);
DECLARE #LABEL BOOLEAN;
SET #counter = 1;
WHILE #counter < 100
BEGIN
IF 0.5 > RAND()
SET #A = TRUE;
ELSE
SET #A = FALSE;
IF 0.5 > RAND()
SET #B = TRUE;
ELSE
SET #B = FALSE;
SET #C = RAND() * 10
SET #LABEL = #A ^ #B OR #LABEL > 5
INSERT INTO data (A,B,C,LABEL) VALUES (#A,#B,#C,#LABEL)
#count = #count +1
END
It says that I have syntax problem
from declaring variables
can you help me?

Answer 1

Is missing some syntax words:
IF... THEN ... ELSE ... END IF;
WHILE ... DO ... END WHILE;
Is important understand that user variables are written as #var_name, so user-defined variables are session-specific. That is, a user variable defined by one client cannot be seen or used by other clients. All variables for a given client session are automatically freed when that client exits. In this case, I think that is not necessary.
SET, either = or := can be used as the assignment operator.
Try this:
delimiter //
CREATE PROCEDURE TEST()
BEGIN
DECLARE counter smallint;
DECLARE A BOOLEAN;
DECLARE B BOOLEAN;
DECLARE C int(4);
DECLARE LABEL BOOLEAN;
SET counter = 1;
WHILE counter < 100 DO
IF 0.5 > RAND() THEN
SET A = TRUE;
ELSE
SET A = FALSE;
END IF;
IF 0.5 > RAND() THEN
SET B = TRUE;
ELSE
SET B = FALSE;
END IF;
SET C = RAND() * 10;
IF A ^ B OR LABEL > 5 THEN
SET LABEL = TRUE;
ELSE
SET LABEL = FALSE;
END IF;
INSERT INTO data (A,B,C,LABEL) VALUES (A,B,C,LABEL);
SET counter = counter +1;
END WHILE;
END//

Answer 2

try this,
DECLARE #counter smallint,
DECLARE #A BOOLEAN,
DECLARE #B BOOLEAN,
DECLARE #C int(4),
DECLARE #LABEL BOOLEAN;