CREATE TABLE table_203_7 (id DECIMAL, "pos." DECIMAL, "artist" TEXT, "single" TEXT, "year" DECIMAL, "sales" DECIMAL, "peak" DECIMAL)

how many singles did celine dion sing ?
SELECT COUNT("single") FROM table_203_7 WHERE "artist" = 'celine dion'
SELECT COUNT("single") FROM "table_203_7" WHERE "artist" = 'celine dion'