# Partition - Rank

# Overview

• Row numbers are unique for each partition
• Rank is the same for rows with the same values in ordered columns. In this case, rank is assigned based on round(value) result. Rank contains gaps and is not consecutive.
• Dense rank is the same for rows with the same values in ordered columns. Dense rank is assigned based on round(value) result. Dense rank is continuously incrementing and has no gaps.

# Query

SELECT entity, round(value), row_number(), rank(), dense_rank()
  FROM "mpstat.cpu_busy"
  WHERE entity IN ('nurswgvml010', 'nurswgvml007')
  AND datetime >= CURRENT_HOUR
  WITH ROW_NUMBER(entity ORDER BY round(value) DESC) <= 6
ORDER BY entity, round(value) DESC

# Results

| entity        | round(value)  | row_number()  | rank()  | dense_rank() |
|---------------|---------------|---------------|---------|--------------|
| nurswgvml007  | 23            | 1             | 1       | 1            | Partition for entity nurswgvml007
| nurswgvml007  | 23            | 2             | 1       | 1            |  Partition for entity nurswgvml007
| nurswgvml007  | 22            | 3             | 3       | 2            |   Partition for entity nurswgvml007
| nurswgvml007  | 22            | 4             | 3       | 2            |    Partition for entity nurswgvml007
| nurswgvml007  | 22            | 5             | 3       | 2            |     Partition for entity nurswgvml007
| nurswgvml007  | 21            | 6             | 6       | 3            |      Partition for entity nurswgvml007
...
| nurswgvml010  | 25            | 1             | 1       | 1            | Partition for entity nurswgvml010
| nurswgvml010  | 25            | 2             | 1       | 1            |  Partition for entity nurswgvml010
| nurswgvml010  | 25            | 3             | 1       | 1            |   Partition for entity nurswgvml010
| nurswgvml010  | 23            | 4             | 4       | 2            |    Partition for entity nurswgvml010
| nurswgvml010  | 18            | 5             | 5       | 3            |     Partition for entity nurswgvml010
| nurswgvml010  | 14            | 6             | 6       | 4            |       Partition for entity nurswgvml010