How to Efficiently Insert Averaged Data from One Table to Another?

Streamlining Data Insertion in Data Warehousing

Data warehousing often involves extracting and transforming data before loading it into a new table. This article demonstrates a simplified solution for a common data insertion task.

The goal is to move data from Table1 to Table2, specifically the LongIntColumn1 and the average of CurrencyColumn1 for each unique LongIntColumn1 value. The following SQL query efficiently accomplishes this:

INSERT INTO Table2 (LongIntColumn2, CurrencyColumn2)
SELECT LongIntColumn1, AVG(CurrencyColumn1) AS CurrencyColumn2
FROM Table1
GROUP BY LongIntColumn1;

This corrected query avoids syntax errors by removing unnecessary elements from the original query, ensuring a smooth data transfer process in your data warehouse. The use of AVG() efficiently calculates the average, and the GROUP BY clause ensures accurate aggregation.

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