在SQL—Server中设置一个列的约束只能是八位字符,前两位是0,3-4为数...答:substring('12345678',1,2)='00'--判断前两位是0 Ascii(substring('12A45678',3,1)) between Ascii('0') and Ascii('9') --判断第三位是数字 Ascii(substring('12A45678',4,1)) between Ascii('0') and Ascii('9') --判断第四位是数字 Ascii(substring('12345678',5,1)) = Ascii...