information_schema系统表——COLLATIONS

该表包含每个字符集的所有信息 

The COLLATIONS table provides information about collations for each character set.

INFORMATION_SCHEMA Name	SHOW Name	Remarks
COLLATION_NAME	Collation
CHARACTER_SET_NAME	Charset	MySQL extension
ID	Id	MySQL extension
IS_DEFAULT	Default	MySQL extension
IS_COMPILED	Compiled	MySQL extension
SORTLEN	Sortlen	MySQL extension

• COLLATION_NAME is the collation name.

• CHARACTER_SET_NAME is the name of the character set with which the collation is associated.

• ID is the collation ID.

• IS_DEFAULT indicates whether the collation is the default for its character set.

• IS_COMPILED indicates whether the character set is compiled into the server.

• SORTLEN is related to the amount of memory required to sort strings expressed in the character set.

查看方式：

1.SELECT COLLATION_NAME FROM INFORMATION_SCHEMA.COLLATIONS [WHERE COLLATION_NAME LIKE 'wild']

2.SHOW COLLATION [LIKE 'wild']