CREATE TABLE table_23956 ("Position" FLOAT, "Race number" CLOB, "Sail number" CLOB, "Yacht" CLOB, "State/country" CLOB, "Yacht type" CLOB, "LOA  ( Metres ) " CLOB, "Skipper" CLOB, "Elapsed time d:hh:mm:ss" CLOB)

How many sail numbers for boat skippered by Geoff Ross?
SELECT COUNT("Sail number") FROM table_23956 WHERE "Skipper" = 'Geoff Ross'
SELECT COUNT("Sail number") FROM "table_23956" WHERE "Skipper" = 'Geoff Ross'