ORACLE-over()函数用法

ORACLE-over()函数用法

over()

SQL> select annual_rate, invest_amount, self_amt from busi_order_bak;

ANNUAL_RATE     INVEST_AMOUNT          SELF_AMT
----------- ----------------- -----------------
      15.00           1000.00            200.00
      15.00           1000.00            200.00
      15.00           2000.00            800.00
       5.00            200.00            500.00
       5.00            100.00             10.00
       5.00            100.00             20.00
       5.00            100.00            200.00

7 rows selected

SQL> select sum(self_amt) from busi_order_bak;

SUM(SELF_AMT)
-------------
         1930

SQL> select annual_rate, invest_amount, self_amt, sum(self_amt) over() from busi_order_bak;

ANNUAL_RATE     INVEST_AMOUNT          SELF_AMT SUM(SELF_AMT)OVER()
----------- ----------------- ----------------- -------------------
      15.00           1000.00            200.00                1930
      15.00           1000.00            200.00                1930
      15.00           2000.00            800.00                1930
       5.00            200.00            500.00                1930
       5.00            100.00             10.00                1930
       5.00            100.00             20.00                1930
       5.00            100.00            200.00                1930

7 rows selected

以上，sum(self_amt) 等同于SUM(SELF_AMT)OVER()，不连续累加，求的是总和。

SQL> select annual_rate, invest_amount, self_amt, sum(self_amt) over(order by annual_rate,invest_amount,self_amt) from busi_order_bak;

ANNUAL_RATE     INVEST_AMOUNT          SELF_AMT SUM(SELF_AMT)OVER(ORDERBYANNUA
----------- ----------------- ----------------- ------------------------------
       5.00            100.00             10.00                             10
       5.00            100.00             20.00                             30
       5.00            100.00            200.00                            230
       5.00            200.00            500.00                            730
      15.00           1000.00            200.00                           1130
      15.00           1000.00            200.00                           1130
      15.00           2000.00            800.00                           1930

7 rows selected

以上按order by annual_rate,invest_amount,self_amt排序，over(order by annual_rate,invest_amount,self_amt)连续累加。

SQL> select annual_rate, invest_amount, self_amt, sum(self_amt) over(partition by annual_rate,invest_amount order by annual_rate,invest_amount) from busi_order_bak;

ANNUAL_RATE     INVEST_AMOUNT          SELF_AMT SUM(SELF_AMT)OVER(PARTITIONBYA
----------- ----------------- ----------------- ------------------------------
       5.00            100.00             20.00                            230
       5.00            100.00             10.00                            230
       5.00            100.00            200.00                            230
       5.00            200.00            500.00                            500
      15.00           1000.00            200.00                            400
      15.00           1000.00            200.00                            400
      15.00           2000.00            800.00                            800

7 rows selected

以上按partition by annual_rate,invest_amount分组，再按order by annual_rate,invest_amount排序计算。