CREATE TABLE table_2962 ("Name" CLOB, "Aperture m" CLOB, "Aper. in" CLOB, "Mirror/type" CLOB, "Nationality/Sponsors" CLOB, "Site" CLOB, "Built/Used" CLOB)

How many nationalities/sponsors for mirror/type schmidt uv?
SELECT COUNT("Nationality/Sponsors") FROM table_2962 WHERE "Mirror/type" = 'Schmidt UV'
SELECT COUNT("Nationality/Sponsors") FROM "table_2962" WHERE "Mirror/type" = 'Schmidt UV'