CREATE TABLE table_78967 ("Date" CLOB, "Ship Name" CLOB, "Tonnage" CLOB, "Ship Type" CLOB, "Location" CLOB, "Disposition of Ship" CLOB)

What date was a brig type ship located in SW Approaches?
SELECT "Date" FROM table_78967 WHERE "Ship Type" = 'brig' AND "Location" = 'sw approaches'
SELECT "Date" FROM "table_78967" WHERE "Location" = 'sw approaches' AND "Ship Type" = 'brig'