按月份计算的Oracle Sql组平均费用

Question

我有一张桌子像

ID    REFGROUP     YEAR   MONTH   VALUE
---     -----    ------  -----   -----
1       1000       2018    1       10
2       1000       2018    2       8 
3       1000       2018    3       12
4       2000       2018    1       6
5       2000       2018    2       8
6       2000       2018    3       1

我想一个月一个月，一个组，一年一个月

ID    REFGROUP     YEAR   MONTH   VALUE
---    -----    ------  -----   -----
1       1000       2018    1       10
2       1000       2018    2       9 
3       1000       2018    3       10
4       2000       2018    1       6
5       2000       2018    2       7
6       2000       2018    3       5

结果将在以上。对于第二个月，得到前两个月的平均分。在第三个月，Iw将获得前三个月组的平均分额和年份。

我每个月都试过工会但是。表现得很慢。我每年都有12个月的时间。如何写sql查询比我写的更快。我的花了8分钟，太贵了

select 1 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=1 GROUP BY REFGROUP,AYEAR
UNION
select 2 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=2 GROUP BY REFGROUP,AYEAR
UNION
select 3 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=3 GROUP BY REFGROUP,AYEAR
UNION
select 4 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=4 GROUP BY REFGROUP,AYEAR
UNION
select 5 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=5 GROUP BY REFGROUP,AYEAR
UNION
select 6 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=6 GROUP BY REFGROUP,AYEAR
UNION
select 7 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=7 GROUP BY REFGROUP,AYEAR
UNION
select 8 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=8 GROUP BY REFGROUP,AYEAR
UNION
select 9 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=9 GROUP BY REFGROUP,AYEAR
UNION
select 10 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=10 GROUP BY REFGROUP,AYEAR
UNION
select 11 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=11 GROUP BY REFGROUP,AYEAR
UNION
select 12 AS AMONTHH, REFGROUP,AYEAR, AVG(TOTAL) from BMS.FNC_W_PAYROL WHERE AMONTH<=12 GROUP BY REFGROUP,AYEAR

Answer 1

我们可以在这里使用解析函数：

SELECT
    ID, REFGROUP, YEAR, MONTH,
    AVG(VALUE) OVER (PARTITION BY REFGROUP, YEAR ORDER BY MONTH) AVG_VALUE
FROM yourTable
ORDER BY
    REFGROUP, YEAR, MONTH;

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Demo

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