CREATE TABLE nuclear_power_plants (id TEXT, name TEXT, latitude TEXT, longitude TEXT, country TEXT, status TEXT, reactortype TEXT, reactormodel TEXT, constructionstartat TEXT, operationalfrom TEXT, operationalto TEXT, capacity TEXT, lastupdatedat TEXT, source TEXT)

Which nation has the most nuclear plants under construction?
SELECT country FROM nuclear_power_plants WHERE status = "Under Construction" GROUP BY country ORDER BY COUNT(*) DESC LIMIT 1
SELECT "country" FROM "nuclear_power_plants" WHERE "Under Construction" = "status" GROUP BY "country" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1