MySQL一个语句查出各种整形占用字节数及最大最小值的实例

2024-07-24 12:52:16

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直接上码：

select 'bigint unsigned' as type ,'8' as bytes ,~0 as max_num,0 as min_num unionselect 'int unsigned','4',~0>>32,0 unionselect 'mediumint unsigned','3',~0>>40,0 unionselect 'smallint unsigned','2',~0>>48,0 unionselect 'tinyint unsigned','1',~0>>56,0 unionselect 'signed bigint','8',~0>>1,-(1<<63) unionselect 'signed int','4',~0>>33,-(1<<31) unionselect 'signed mediumint','3',~0>>41,-(1<<23) unionselect 'signed smallint','2',~0>>49,-(1<<15) unionselect '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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