CREATE TABLE table_204_628 (id DECIMAL, "trial number" TEXT, "date" TEXT, "name of trial" TEXT, "celebrity/ies taking part" TEXT, "winner/number of stars" TEXT, "notes" TEXT)

who won the trial before phina ?
SELECT "winner/number of stars" FROM table_204_628 WHERE "date" < (SELECT "date" FROM table_204_628 WHERE "winner/number of stars" = 'phina') ORDER BY "date" DESC LIMIT 1
SELECT "winner/number of stars" FROM "table_204_628" WHERE "date" < (SELECT "date" FROM "table_204_628" WHERE "winner/number of stars" = 'phina') ORDER BY "date" DESC NULLS LAST LIMIT 1