`information_schema.parameters.character_maximum_length`

mysql

type: BIGINT NULL

5.7-8

type: NULL

Note:

Maximum length.

5.1-10.8

type: CARDINAL_NUMBER NULL

Note:

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

10-15

type: CARDINAL_NUMBER

Note:

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

7.4-9.6

type: NULL

Note:

Always NULL.

type: INT NULL

Note:

Maximum length in characters for binary or character data types. -1 for xml and large-value type data. Otherwise, returns NULL.