直接上码。，select &#39；bigint unsigned&#39；as type ，&#39；8&#39；as bytes ，~0 as max_num，0 as min_num unionselect &#39；int unsigned&#39；，&#39；4&#39；，~0&gt；&gt；32，0 unionselect &#39；mediumint unsigned&#39；，&#39；3&#39；，~0&gt；&gt；40，0 unionselect &#39；smallint unsigned&#39；，&#39；2&#39；，~0&gt；&gt；48，0 unionselect &#39；tinyint unsigned&#39；，&#39；1&#39。