Difference Between PARTITION BY and GROUP BY
Let’s compare PARTITION BY and GROUP BY in a tabular format.
Feature |
PARTITION BY |
GROUP BY |
---|---|---|
Purpose |
It is Used with window functions for partitioning data |
It is Used for aggregating data based on one or more columns |
Aggregation |
It Performs calculations within each partition |
It Aggregates data across the entire result set |
Output |
It Retains all rows in the output |
It Aggregates rows and summarizes data into groups |
Result |
It gives Set Size Result set size may remain unchanged |
It gives Result set size may decrease due to aggregation |
PARTITION BY vs GROUP BY in SQL
In SQL both PARTITION BY and GROUP BY are important clauses used for data aggregation and analysis. Sometimes they work as same but they serve different purposes and are applied in different situations. In this article, we’ll understand both of them along with the syntax, multiple examples for both clauses and also the differences between them.