CREATE TABLE table_42174 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What was the margin of victory on Apr 8, 1979?
SELECT "Margin of victory" FROM table_42174 WHERE "Date" = 'apr 8, 1979'
SELECT "Margin of victory" FROM "table_42174" WHERE "Date" = 'apr 8, 1979'