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ingres_field_precision() returns
the precision of a field. This value is used only for
decimal, float and money SQL data types. 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().