SQL Easter egg

There is a tentative Obfuscated SQL contest with one entry by Kai Voigt.

SELECT CONCAT(CONV(536,8,20), LPAD(EXPORT_SET(1,'Y','N','',1), 3, "P"), CHAR(32), HEX(234), UNHEX(594939469*POW(3,2)))

Not bad, but ... SQL without data ? Doesn't sound right.
Here's my take (requires MySQL 4.1 or later):

drop table if exists complex;
drop table if exists simple;
CREATE TABLE complex ( simple char(2), complex char(1)) ;
CREATE TABLE simple ( complex char(2), simple char(1));

INSERT INTO complex VALUES ('0','7'),('1','6'),('2','6'),('3','6'),('4','2'),
('5','7'),('6','7'),('7','7'),('8','6'),('10','7'),('11','7'),('12','2'),
('13','7'),('14','6'),('15','6'),('24','2'),('25','6'),('26','6'),('27','6'),
('28','6'),('29','6'),('30','7'),('31','6');
INSERT INTO simple VALUES ('0','4'),('1','F'),('2','5'),('3','8'),('4','0'),
('5','2'),('6','1'),('7','3'),('8','A'),('10','3'),('11','5'),('12','0'),
('13','4'),('14','E'),('15','1'),('24','0'),('25','c'),('26','1'),('27','8'),
('28','b'),('29','3'),('30','2'),('31','5');
set @complex = sqrt(sqrt(0x19a1));
set @simple  = sqrt(sqrt(sqrt(0x290D741)));
select group_concat(unhex(concat(simple,complex))
order by complex.non_simple separator '' )
from (select simple ^ @complex non_simple, complex simple from complex) simple natural join
(select complex ^ @simple non_simple, simple complex from simple) complex ;

Enjoy!