`information_schema.collations.character_set_name`

mysql

type: VARCHAR NOT NULL

5.7-8

mariadb

type: NULL

Note:

Associated character set.

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5.1-10.8

type: VARCHAR NOT NULL

Note:

Associated character set.

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10.2-10.7

tidb

type: VARCHAR(32) NULL

Note:

The name of the character set which the collation belongs to.

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4-6.1

postgres

cockroachdb

mssql