SELECT 
	EMP_CODE
	, EMP_NAME
	, SEX
	, BIRTHDAY
FROM
	TBL_EMPLOYEES
WHERE
	1=1
	AND (
		EMP_CODE <= 4 
		OR SEX = 'M'
	)
	AND BIRTHDAY BETWEEN '1981-01-01' AND '1981-12-31'
ORDER BY
	EMP_CODE
;