`information_schema.parameters.parameter_name`

mysql

type: VARCHAR NULL

5.7-8

type: NULL

Note:

Name of the parameter, or NULL for RETURNS.

5.1-10.8

type: SQL_IDENTIFIER NULL

Note:

Name of the parameter, or null if the parameter has no name

10-15

type: SQL_IDENTIFIER

Note:

Name of the parameter, or null if the parameter has no name

8-9.6

Note:

Always null, since PostgreSQL does not support named parameters

7.4

type: NULL

Note:

Always NULL.

type: NVARCHAR(128) NULL

Note:

Name of the parameter. NULL if this corresponds to the return value of a function.