Oracle 、SqlServer 根据日期逐日、逐月递增累加、逐行累加

动态追加日累计、月累计：

1. 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 ;

1. 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；

1. 使用OVER 结合 PARTITION BY 对每月进行累加；

select scrq,sum(rsj) over(partition by to_char(scrq,'yyyy-mm') order by scrq) ysj from tb_test_over order by scrq；

1. 综合版，查询日、月、年累加数据；

select 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,A','[^,]+',1,ROWNUM) as str FROM DUAL CONNECT BY ROWNUM <= LENGTH ('A,A') - LENGTH (REPLACE ('A,',',''))+1;