CREATE TABLE table_19846 ("No." FLOAT, "Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "To par" CLOB, "Margin of victory" CLOB, "Runner-up" CLOB)

The tournament Buick Classic occured on what dates?
SELECT "Date" FROM table_19846 WHERE "Tournament" = 'Buick Classic'
SELECT "Date" FROM "table_19846" WHERE "Tournament" = 'Buick Classic'