int(11)和int(11)UNSIGNED有什么区别?

问题描述

int(11)和int(11) UNSIGNED有什么区别?

解决方案

UNSIGNED类型不能为负，但另一方面，它的范围是正整数的两倍.类型TINYINT，SMALLINT，MEDIUMINT，INT和BIGINT都有签名和未签名的版本.

对于INT，范围定义如下:

Type          Storage         Min           Max
INT                 4 -2147483648    2147483647
INT UNSIGNED        4           0    4294967295

有符号和无符号类型占用相同的存储空间(INT为4字节).

有关详细信息，请参见文档. /p>

What's the difference in int(11) and int(11) UNSIGNED ?

解决方案

An UNSIGNED type cannot be negative, but on the other hand it has twice as large a range for the positive integers. The types TINYINT, SMALLINT, MEDIUMINT,INT and BIGINT all have signed and unsigned versions.

For INT the ranges are defined as follows:

Type          Storage         Min           Max
INT                 4 -2147483648    2147483647
INT UNSIGNED        4           0    4294967295

The signed and unsigned types take the same storage space (4 bytes for INT).

See the documentation for more details.

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