Tag: inline view

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Multi-level Aggregation

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Multi-level Aggregation You perform a multi-level aggregation when you need to combine data from different levels of aggregation. In this article, you’ll look at an example of how you might perform a multi-level aggregation within a single SQL query that contains subqueries, sending the aggregated data from the inner to the higher level of the query and combining the aggregated...

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How To Not Include a Column From The SELECT List In The GROUP BY Clause

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How To Not Include a Column From The SELECT List In The GROUP BY Clause Sometimes you don’t need to group by each column or expression included in the SELECT list of the query. For example, you may want to not include ROWNUM in the GROUP BY clause in spite of the fact that it appears in the SELECT list....

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