`information_schema.routines.collation_schema`

mysql

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:

Always returns NULL.