CREATE TABLE table_31221 ("Skip  ( Club ) " TEXT, "W" FLOAT, "L" FLOAT, "PF" FLOAT, "PA" FLOAT, "Ends Won" FLOAT, "Ends Lost" FLOAT, "Blank Ends" FLOAT, "Stolen Ends" FLOAT)

What is the L when the W is 4?
SELECT MIN("L") FROM table_31221 WHERE "W" = '4'
SELECT MIN("L") FROM "table_31221" WHERE "W" = '4'