MySQL一個(gè)語句查出各種整形占用字節(jié)數(shù)及最大最小值的實(shí)例
發(fā)布日期：2022-06-12 11:19 | 文章來源：腳本之家
直接上碼：
select 'bigint unsigned' as type ,'8' as bytes ,~0 as max_num,0 as min_num union select 'int unsigned','4',~0>>32,0 union select 'mediumint unsigned','3',~0>>40,0 union select 'smallint unsigned','2',~0>>48,0 union select 'tinyint unsigned','1',~0>>56,0 union select 'signed bigint','8',~0>>1,-(1<<63) union select 'signed int','4',~0>>33,-(1<<31) union select 'signed mediumint','3',~0>>41,-(1<<23) union select 'signed smallint','2',~0>>49,-(1<<15) union select 'signed tinyint','1',~0>>57,-(1<<7); +--------------------+-------+----------------------+----------------------+ | type | bytes | max_num | min_num | +--------------------+-------+----------------------+----------------------+ | bigint unsigned | 8 | 18446744073709551615 | 0 | | int unsigned | 4 | 4294967295 | 0 | | mediumint unsigned | 3 | 16777215 | 0 | | smallint unsigned | 2 | 65535 | 0 | | tinyint unsigned | 1 | 255 | 0 | | signed bigint | 8 | 9223372036854775807 | -9223372036854775808 | | signed int | 4 | 2147483647 | -2147483648 | | signed mediumint | 3 | 8388607 | -8388608 | | signed smallint | 2 | 32767 | -32768 | | signed tinyint | 1 | 127 | -128 | +--------------------+-------+----------------------+----------------------+ rows in set (0.00 sec)
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