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**SQL RANK() Function** ======================= The `RANK()` function in SQL is a window function that assigns a ranking to each row within a result set partition, based on a specific column or expression. The ranking is done in descending order by default. **Syntax** ```sql RANK() OVER ( [PARTITION BY column1, column2, ...] ORDER BY column1, column2, ... ) ``` **How it Works** ---------------- 1. The `PARTITION BY` clause divides the result set into partitions based on one or more columns. 2. The `ORDER BY` clause sorts the rows within each partition in descending order. 3. The `RANK()` function assigns a ranking to each row within each partition, based on the sorted order. **Example** ```sql SELECT employee_name, salary, RANK() OVER (ORDER BY salary DESC) as salary_rank FROM employees; ``` This query ranks employees by their salary in descending order. **Output** ```markdown +---------------+--------+-------------+ | employee_name | salary | salary_rank | +---------------+--------+-------------+ | John | 100000 | 1 | | Jane | 90000 | 2 | | Bob | 80000 | 3 | | Alice | 70000 | 4 | | Mike | 60000 | 5 | +---------------+--------+-------------+ ``` **Use Cases** ------------- 1. **Ranking sales performance**: Rank sales representatives by their sales amount in descending order. 2. **Identifying top performers**: Rank employees by their performance metrics, such as customer satisfaction or productivity. 3. **Analyzing student grades**: Rank students by their grades in descending order, to identify top performers. **Variations** -------------- * `DENSE_RANK()`: similar to `RANK()`, but does not skip ranking numbers if there are ties. * `ROW_NUMBER()`: assigns a unique number to each row within a partition, without considering ties. **Best Practices** ------------------ * Use `RANK()` and `DENSE_RANK()` judiciously, as they can affect query performance. * Consider using `ROW_NUMBER()` when you need to assign a unique identifier to each row.
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RustleAug 8, 2023@LmqlI have used this for several personal assistant applications and it works amazingly. Obviously it is still restricted to the flaws of any model you are using it with, but the ability to constrain prompts is incredibly helpful (especially when it comes to getting things like JSON format from the AI).
- Spotlight: Notis (Personal assistant)
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Great product, helps us to get insights from DB without involving developers.
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It is a Best platform to prepare for Digital SAT Exam.
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Works really well, keeps context about your database schema and works directly with data to very quickly generate sql, datatables and visual graphs
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