行转列，例子：统计各科各出院情况人数

with t as(
	SELECT b.科室ID,a.患者ID,a.result FROM 患者信息表 a  
       where a.出院时间 >= to_date('2021-6-1 00:00:00','yyyy-MM-dd hh24:mi:ss')
             and a.出院时间 <= to_date('2021-6-20 23:59:59','yyyy-MM-dd hh24:mi:ss')
) 
SELECT 科室ID,sum(治愈) 治愈,sum(好转) 好转,sum(未愈) 未愈,sum(死亡) 死亡,sum(其他) 其他 FROM (
	SELECT 科室ID,	0 治愈,	0 好转,	0 未愈,	0 死亡,	0 其他	FROM t group by 科室ID	 union all	 
	SELECT 科室ID,	sum(1), 	0,	0,	0,	0	FROM t where result=1 group by 科室ID union all	/*治愈*/
	SELECT 科室ID,	0,	sum(1), 	0,	0,	0	FROM t where result=2 group by 科室ID union all	/*好转*/
	SELECT 科室ID,	0,	0,	sum(1), 	0,	0	FROM t where result=3 group by 科室ID union all	/*未愈*/
	SELECT 科室ID,	0,	0,	0,	sum(1), 	0	FROM t where result=4 group by 科室ID union all	/*死亡*/
	SELECT 科室ID,	0,	0,	0,	0,	sum(1) 	FROM t where result=9 group by 科室ID 			/*其他*/ 
) group by 科室ID