如何在不同条件的sql server的case语句中插入多个else？

SELECT column_name,
       CASE
           WHEN condition1 THEN result1
           WHEN condition2 THEN result2
           ELSE result3
       END AS result
FROM table_name;

SELECT column_name,
       CASE
           WHEN condition1 THEN result1
           WHEN condition2 THEN result2
           ELSE
               CASE
                   WHEN condition3 THEN result3
                   ELSE result4
               END
       END AS result
FROM table_name;