oracle分组汇总统计函数grouping, 以小计, 总计的形式展示

grouping（columnA）函数的意思：当前行如果是由rollup汇总产生的，那么columnA这个字段值为1否则为0

原数据：

 通过grouping查询后的数据：

 sql:

select decode(grouping(f_line)+grouping(f_workarea),1,'小计',2,'总计',f_workarea) f_workarea,
decode(grouping(f_line),1,count(*)||'条',f_line) f_line,
sum(f_pagesnumber) sum_pagesnumbers  
from t_testcount 
group by rollup (f_workarea,f_line);

建表数据：

CREATE TABLE t_testcount
   (  
   "F_ID" NUMBER(10,0) , 
  "F_WORKAREA" NVARCHAR2(255) , 
  "F_LINE" NVARCHAR2(255) , 
  "F_REMARK" NVARCHAR2(255), 
"F_YEAR" VARCHAR2(20 BYTE),
  "F_PAGESNUMBER" NVARCHAR2(255)
  );
 
insert into T_TESTCOUNT (f_id, f_workarea, f_line, f_remark, f_year, f_pagesnumber)
values (1, 'a', 'a1', null, '2014', '1');
insert into T_TESTCOUNT (f_id, f_workarea, f_line, f_remark, f_year, f_pagesnumber)
values (2, 'a', 'a2', null, '2013', '2');
insert into T_TESTCOUNT (f_id, f_workarea, f_line, f_remark, f_year, f_pagesnumber)
values (3, 'a', 'a3', null, '2014', '3');
insert into T_TESTCOUNT (f_id, f_workarea, f_line, f_remark, f_year, f_pagesnumber)
values (4, 'b', 'b1', null, '2014', '1');