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ingres_field_scale() returns the
scale of a field. This value is used only for the decimal SQL
data type. For detailed information, see the Ingres/OpenAPI
User Guide - Appendix C.
index is the number of
the field and must be between 1 and the value given by
ingres_num_fields().
See also ingres_query(),
ingres_fetch_array(),
ingres_fetch_object(), and
ingres_fetch_row().