Int Data Type Syntax

Required Storage and Range for Integer Types Supported by MySQL

TINYINT

TINYINT[(M)] [UNSIGNED] [ZEROFILL]

A very small integer. The signed range is -128 to 127. The unsigned range is 0 to 255.

SMALLINT

A small integer. The signed range is -32768 to 32767. The unsigned range is 0 to 65535.

MEDIUMINT

MEDIUMINT[(M)] [UNSIGNED] [ZEROFILL]

A medium-sized integer. The signed range is -8388608 to 8388607. The unsigned range is 0 to 16777215.

INT

INT[(M)] [UNSIGNED] [ZEROFILL]

A normal-size integer. The signed range is -2147483648 to 2147483647. The unsigned range is 0 to 4294967295.

INTEGER

INTEGER[(M)] [UNSIGNED] [ZEROFILL]

This type is a synonym for INT.

BIGINT

BIGINT[(M)] [UNSIGNED] [ZEROFILL]

A large integer. The signed range is -9223372036854775808 to 9223372036854775807. The unsigned range is 0 to 18446744073709551615.

SERIAL

SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE.

DEMO

create table serial_test (id SERIAL);

从图可知，是无符号的bigint类型，不能为空，主键，自动增长

1个表中，指定多个字段为serial，会报错(Incorrect table definition; there can be only one auto column and it must be defined as a key)

BOOL, BOOLEAN

These types are synonyms for TINYINT(1). A value of zero is considered false. Nonzero values are considered true.

0是fase，不为0是true

最后

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