Oracle内根据上一行总数和本行新增数计算本行总数

--1. 初始化每个区县的 第一条退休人口数据
update T_FACT_SOCAIL_RETIRED t
set t.totalcount = t.newcount
where t.day = (select min(t2.day) from T_FACT_SOCAIL_RETIRED t2 where t2.areacode = t.areacode);

--2.循序渐进，计算后面每天 的退休人口总数,思路是，第二天的 退休人口总数 = 第一天的退休人口总数 + 第二天新增的退休人口总数，以此类推
begin
--
for t in (select * from T_FACT_SOCAIL_RETIRED  t3
where t3.areacode = '340222' and t3.totalcount = 0 order by t3.day asc) loop
update T_FACT_SOCAIL_RETIRED r
set r.totalcount = r.newcount + (select totalcount from ((select r2.totalcount from T_FACT_SOCAIL_RETIRED r2 where r2.areacode = t.areacode and r2.day < t.day order by r2.day desc)) where rownum = 1)
where r.day = t.day and r.areacode = t.areacode;
end loop;
end;

begin
for tt in (select distinct areacode from T_FACT_SOCAIL_RETIRED) loop
for t in (select * from T_FACT_SOCAIL_RETIRED  t3
where t3.areacode = tt.areacode and t3.totalcount = 0 order by t3.day asc) loop
update T_FACT_SOCAIL_RETIRED r
set r.totalcount = r.newcount + (select totalcount from ((select r2.totalcount from T_FACT_SOCAIL_RETIRED r2 where r2.areacode = t.areacode and r2.day < t.day order by r2.day desc)) where rownum = 1)
where r.day = t.day and r.areacode = t.areacode;
end loop;
end loop;
end;

--插入每天不存在的区县
begin
for tt2 in (select distinct day from T_Fact_Gas_Account) loop
for tt in (select t1.areacode from t_dim_area t1 where t1.areatype in ('3','4') and t1.areacode
not in (select t2.areacode from T_Fact_Gas_Account t2 where t2.day=tt2.day)) loop
insert into T_Fact_Gas_Account values (substr(tt2.day,1,4),substr(tt2.day,1,6),tt2.day,tt.areacode,0,0);
end loop;
end loop;
end;

--更新当前总数
begin
for tt in (select distinct areacode from T_Fact_Gas_Account) loop
for t in (select * from T_Fact_Gas_Account  t3
where t3.areacode = tt.areacode and t3.totalcount = 0 order by t3.day asc) loop
update T_Fact_Gas_Account r
set r.totalcount = r.newcount + nvl((select totalcount from ((select r2.totalcount from T_Fact_Gas_Account r2 where r2.areacode = t.areacode and r2.day < t.day order by r2.day desc)) where rownum = 1),0)
where r.day = t.day and r.areacode = t.areacode;
end loop;
end loop;
end;