CREATE TABLE table_203_545 (id DECIMAL, "single/ep" TEXT, "release date" TEXT, "label" TEXT, "format ( s ) " TEXT, "uk singles chart position" DECIMAL, "notes" TEXT)

how many singles were on the uk singles chart ?
SELECT COUNT("single/ep") FROM table_203_545 WHERE NOT "uk singles chart position" IS NULL
SELECT COUNT("single/ep") FROM "table_203_545" WHERE NOT "uk singles chart position" IS NULL