The following editor will bring you an articleMySQLAn example of finding out the number of bytes occupied by various integers and the maximum and minimum values using one statement.
Directly code:
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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