information_schema.routines.numeric_precision

Note:

For numeric types, the precision (number of significant digits) for the column. NULL if not a numeric field.

Note:

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

Note:

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

Note:

Always NULL.

Note:

Numeric precision of the return value. For the nonnumeric types, returns NULL.