So far, here is what I figured out by walking the cluster returned
from isc_dsql_sql_info() on an update stmt:

two serial clusters returned:

First is isc_info_sql_records.

Second is isc_info_end;

the isc_info_sql_records clusters embedded with 4 clusters:

Cluster 1.1 is isc_info_req_update_count, which imbedded count value
0x0001.

Cluster 1.2 is isc_info_req_delete_count, which imbedded count value
0x0000.

Cluster 1.3 is isc_info_req_select_count, which imbedded count value
0x0001.

Cluster 1.4 is isc_info_req_insert_count, which imbedded count value
0x0000.

The only stme executed is SQL update, why did the select return a
count of 1?

jml