`information_schema.routines.collation_name`

mysql

type: VARCHAR NULL

5.7-8

type: NULL

Note:

Collation if a non-binary string data type, otherwise NULL.

5.1-10.8

type: SQL_IDENTIFIER NULL

Note:

Always null, since this information is not applied to return data types in PostgreSQL

10-15

type: SQL_IDENTIFIER

Note:

Always null, since this information is not applied to return data types in PostgreSQL

9.1-9.6

Note:

Applies to a feature not available in PostgreSQL

7.4-9

type: NULL

Note:

Always NULL.

type: NVARCHAR(128) NULL

Note:

Collation name of the return value. For noncharacter types, returns NULL.