user: Question: Who directed the film that had Phyllis Welch as the leading lady?
Columns: ['Release date', 'Length', 'Director(s)', 'Character name', 'Character type', 'Leading lady']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['October 12, 1929', '10297ft. 115 min.', 'Mal St. Clair Clyde Bruckman', 'Harold Bledsoe', 'Industrious Detective', 'Barbara Kent']
SQL:

assistant: SELECT "Director(s)" FROM "Table" WHERE "Leading lady" = 'Phyllis Welch';