What are the parameters of the row_number() function in SQL?
In SQL, the ROW_NUMBER() function is used to assign unique sequential numbers to rows in a query result set. ROW_NUMBER() function is typically used within window functions. The syntax for this function is as follows:
ROW_NUMBER() OVER (PARTITION BY expr1, expr2,... ORDER BY expr3, expr4,...)
The parameters include:
- PARTITION BY expr1, expr2,…: Optional, specifies the columns or expressions used for grouping.
- ORDER BY expr3, expr4,…: This is a required option that specifies which columns to sort by in order to determine the order of rows.
By combining these parameters, the ROW_NUMBER() function can assign a unique number to each row based on specified sorting rules and grouping methods, making it easier to further filter and process the results.
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