MySQL使用一個語句就可以查出各種整形佔用位元組數及最大值最小值的範例程式碼

下面小編就為大家帶來一篇MySQL一個語句查出各種整形佔用位元組數及最大最小值的實例。

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 &#39;signed bigint&#39;,&#39;8&#39;,~0>>1,-(1<<63) union
select &#39;signed int&#39;,&#39;4&#39;,~0>>33,-(1<<31) union
select &#39;signed mediumint&#39;,&#39;3&#39;,~0>>41,-(1<<23) union
select &#39;signed smallint&#39;,&#39;2&#39;,~0>>49,-(1<<15) union
select &#39;signed tinyint&#39;,&#39;1&#39;,~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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