mysql中判断条件

 SELECT CASE 1 WHEN 1 THEN "one" WHEN 2 THEN "two" ELSE "more" END; -> "one"
    SELECT CASE WHEN 1>0 THEN "true" ELSE "false" END; -> "true"
    SELECT CASE BINARY "B" WHEN "a" THEN 1 WHEN "b" THEN 2 END; -> NULL

    (1) CASE VALUE WHEN [compare-VALUE] THEN result [WHEN [compare-VALUE] THEN result ...] [ELSE result] END //这个我还没想到咋用，知道的可以留言交流，
    (2) CASE WHEN [CONDITION] THEN result [WHEN [CONDITION] THEN result ...] [ELSE result] END //这个面试时被人问到了,可以用作条件判断
 SELECT CASE 1 W