How to select the top-N rows per group with SQL in Oracle Database
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How to select the top-N rows per group with SQL in Oracle Database
Fetching the first N rows from a result set is easy with the fetch first clause. But what if you want the top-N rows in each group? For example, the three most recent orders for each customer? Oracle Database 23ai adds new syntax to do this. In this post we'll explore how the new syntax works and approaches that work in earlier releases.
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