information_schema.parameters.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 parameter data types in PostgreSQL

Note:

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

Note:

Always NULL.

Note:

Precision of approximate numeric data, exact numeric data, integer data, or monetary data. Otherwise, returns NULL.