sql - 每月 Oracle Sql 组平均值

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

我想按组和按年逐月获得平均

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

结果会在上面。第二个月，获得前两个月的平均值。对于第三个月，Iw 将通过 refgroup 和年份获得前三个月组的平均值。

我每个月都尝试过工会，但是。它使性能变慢。我每年都会做12个月。怎么写sql查询比我写的快。我的需要8分钟，这太多了

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

标签： sqloracle

Answer 1

我们可以在这里使用分析函数：

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

演示