Oracle Sql Group平均因月

Question

我有一张桌子，

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

我想按组和年份逐月获取平均值

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

结果将在上方。对于第二个月，请获取前两个月的平均值。对于第三个月，Iw将按refgroup和year得到前三个月分组的平均值。

我每个月都尝试工会。这会降低性能。我将每年的时间都定为12个月。怎么写sql查询才能比我写的快。排雷要花费8分钟，这太花了

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

我们可以在此处使用解析函数：

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

Demo