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)

what was the release date of the first single ?
SELECT "release date" FROM table_203_545 ORDER BY "release date" LIMIT 1
SELECT "release date" FROM "table_203_545" ORDER BY "release date" NULLS FIRST LIMIT 1