别忘了2月29日......
SELECT c.name FROM cust c WHERE ( MONTH(c.birthdate) = MONTH(@suppliedDate) AND DAY(c.birthdate) = DAY(@suppliedDate) ) OR ( MONTH(c.birthdate) = 2 AND DAY(c.birthdate) = 29 AND MONTH(@suppliedDate) = 3 AND DAY(@suppliedDate) = 1 AND (YEAR(@suppliedDate) % 4 = 0) AND ((YEAR(@suppliedDate) % 100 != 0) OR (YEAR(@suppliedDate) % 400 = 0)) )