Oracle SQL:使用Select语句在insert中使用序列

Question

基本上我想运行以下查询:

INSERT INTO historical_car_stats (historical_car_stats_id, year, month, make, model, region, avg_msrp, count)
  SELECT
    my_seq.nextval,
    '2010',
    '12',
    'ALL',
    'ALL',
    region,
    sum(avg_msrp * count) / sum(count),
    sum(count)
  FROM historical_car_stats
  WHERE year = '2010'
        AND month = '12'
        AND make != 'ALL'
  GROUP BY region;

它不起作用,因为"此处不允许序列号"SQL错误.我怎么写这个,以便Oracle让我做我想做的事情？

Answer 1

假设你想在生成序列的密钥之前对数据进行分组,这听起来像你想要的东西

INSERT INTO HISTORICAL_CAR_STATS (
    HISTORICAL_CAR_STATS_ID, 
    YEAR,
    MONTH, 
    MAKE,
    MODEL,
    REGION,
    AVG_MSRP,
    CNT) 
SELECT MY_SEQ.nextval,
       year,
       month,
       make,
       model,
       region,
       avg_msrp,
       cnt
  FROM (SELECT '2010' year,
               '12' month,
               'ALL' make,
               'ALL' model,
               REGION,
               sum(AVG_MSRP*COUNT)/sum(COUNT) avg_msrp,
               sum(cnt) cnt
          FROM HISTORICAL_CAR_STATS
         WHERE YEAR = '2010' 
           AND MONTH = '12'
           AND MAKE != 'ALL' 
         GROUP BY REGION)

Answer 2

我测试了,脚本运行正常!

INSERT INTO HISTORICAL_CAR_STATS (HISTORICAL_CAR_STATS_ID, YEAR,MONTH,MAKE,MODEL,REGION,AVG_MSRP,COUNT) 
WITH DATA AS
(
    SELECT '2010' YEAR,'12' MONTH ,'ALL' MAKE,'ALL' MODEL,REGION,sum(AVG_MSRP*COUNT)/sum(COUNT) AVG_MSRP,sum(Count) COUNT
    FROM HISTORICAL_CAR_STATS
    WHERE YEAR = '2010' AND MONTH = '12'
    AND MAKE != 'ALL' GROUP BY REGION
)
SELECT MY_SEQ.NEXTVAL, YEAR,MONTH,MAKE,MODEL,REGION,AVG_MSRP,COUNT
FROM DATA;

你可以阅读这篇文章了解更多! http://www.orafaq.com/wiki/ORA-02287