case when 嵌套使用SELECT CASE WHEN (CASE WHEN 21 THEN 1 ELSE 0 END)1 THEN (CASE WHEN (CASE WHEN 2
case when 嵌套使用 SELECT CASE WHEN (CASE WHEN 2>1 THEN 1 ELSE 0 END)=1 THEN (CASE WHEN (CASE WHEN 2>1 THEN 1 ELSE 0 END)<1 THEN 1 ELSE 0 END)ELSE (CASE WHEN 2>1 THEN 1 ELSE 0 END)END
