oracle - 如何添加行值？

Question

DATE       PCODE         ACODE             TRAFFIC      DIFFERENCE
25-02-2013  S_HDFCBANK  S_HDFCBANK     15085056
24-02-2013  S_HDFCBANK  S_HDFCBANK     9118809

请帮助我了解两个日期的流量差异并添加到最后一列。

Answer 1

你可以这样做：

SQL> select dte,pcode,acode,traffic,
  2         traffic - lag(traffic) over (order by dte) difference
  3    from data
  4   order by 1, 2, 3;

DTE       PCODE      ACODE         TRAFFIC DIFFERENCE
--------- ---------- ---------- ---------- ----------
24-FEB-13 S_HDFCBANK S_HDFCBANK    9118809
25-FEB-13 S_HDFCBANK S_HDFCBANK   15085056    5966247

如果您pcode acode每个日期有很多并且想要单独处理这些，您需要将分析更改为

lag(traffic) over (partition by pcode,acode order by dte) difference