MySQL使用一个语句就可以查出各种整形占用字节数及最大最小值的示例代码
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2022-05-08 19:54:01
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下面小编就为大家带来一篇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。
直接上码:
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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