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动态追加日累计、月累计：
测试表tb_test_over 中有SCRQ、RSJ两列，存储每日的日数据；
select * from tb_test_over ;
使用OVER函数动态追加列，根据SCRQ对RSJ累计求和；
select scrq,rsj,
sum(rsj) over(order by scrq) as nsj
from tb_test_over order by scrq；
使用OVER 结合 PARTITION BY 对每月进行累加；
select scrq,rsj,sum(rsj)
over(partition by to_char(scrq,'yyyy-mm') order by scrq) ysj
from tb_test_over
order by scrq；
综合版，查询日、月、年累加数据；
select scrq,rsj,
sum(rsj) over(partition by to_char(scrq,'yyyy-mm') order by scrq) ysj,
sum(rsj) over(order by scrq) as nsj
from tb_test_over
order by scrq；
5、最后追加一个动态字符列转行技巧；
有'A,B,V,C,D,S,A'这么一个字符串，根据逗号，将数据输出到每行；
SELECT REGEXP_SUBSTR ('A,B,V,C,D,S,A', '[^,]+', 1,ROWNUM) as str
FROM DUAL
CONNECT BY ROWNUM <=
LENGTH ('A,B,V,C,D,S,A') - LENGTH (REPLACE ('A,B,V,C,D,S,A', ',', ''))+1;
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转播
