user: Question: Who was the opponent when the result was UD 12/12 and date was 1993-05-22?
Columns: ['Number', 'Name', 'Titles', 'Date', 'Opponent', 'Result', 'Defenses']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'Thomas Hearns', 'WBA Welterweight (147)', '1980-08-02', 'Pipino Cuevas', 'TKO 2/15', 3.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Result" = 'UD 12/12' AND "Date" = '1993-05-22';