Difference Between PARTITION BY and GROUP BY in PL/SQL
Aspect | PARTITION BY | GROUP BY |
---|---|---|
Functionality | Splits the result set into partitions for window functions | Groups rows based on common values for aggregate functions |
Scope | Operates within the context of window functions | Applies to the entire result set |
Usage | Typically used with analytical/window functions | Used with aggregate functions |
Result Set | Partitions the result set, retaining all rows | Reduces the result set to summary rows |
Aggregation | Computes separate calculations for each partition | Computes aggregate functions for each group |
Retained Rows | Retains all rows in the result set | Reduces rows to summary rows |
Example | SUM(sales) OVER (PARTITION BY region) |
SELECT region, SUM(sales) FROM table GROUP BY region |
Difference Between PARTITION BY and GROUP BY in PL/SQL
Effective data manipulation during SQL queries especially while using PL/SQL is critical for obtaining the highest possible performance on database operations. We will mostly use two clauses for achieving these tasks and they are PARTITION BY and GROUP BY.
Although they both are meant for data organization, however, they work in a completely different manner and also can be useful in different scenarios. Such dissimilarities have to be studied if you would like to get relevant and meaningful answers.
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