postgresql - Aggregating an average -


i trying aggregate average position of digital marketing ads using following query;

insert ad_copies_without_conversions_aggregate ( select "key"   ,sum("clicks") "clicks"  ,sum("impressions") "impressions",  sum("cost") "cost",  **sum(("avg. position" * "impressions")* "impressions") "avg. position"**    ad_copies_without_conversions_preaggregate  group "key");

the average position weighted impressions free calculation between 2 rows follows

key    |avg pos|impressions|avg position * impressions| -------+-------+-----------+--------------------------+ abcd   |4      |4000       |16000 efgh   |2      |5000       |4000 total  |6      |9000       |20000

the final calculation applied each unique row should follows;

(column)|avg position * impressions| / impressions


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