Window Functions in Apache Age

Question

I was looking over the window functions and wanted to know if we can use window functions like (rank, dense_rank, ntile etc.) in Apache-age. If yes, is there any practical example of using them.

I am looking for window functions in graph databases (especially Apache-Age)

Answer 1

You can definitely use these functions in apache-age.

Let's take an example of rank() function, A rank() function is used to assign a rank to each row within a partition based on a specified ordering.

SELECT id, name, score, rank() OVER (ORDER BY score DESC) AS ranking
FROM your_table;

The rank() function is applied over the score column, and the result is returned as the ranking column in the output. The ORDER BY clause specifies the column by which the ranking is determined.

The result will include the id, name, score, and ranking columns, where the ranking column represents the rank of each row based on the score column.

Answer 2

Apache AGE is a PostgreSQL extension, so you can use any function that works in Postgres normally even with the extension loaded. For instance, you can use rank() using its syntax:

RANK() OVER (
    [PARTITION BY partition_expression, ... ]
    ORDER BY sort_expression [ASC | DESC], ...
)

For more examples, you can use this website and the docs

Answer 3

You can use PostgreSQL's built-in windows function inside your Apache AGE application, since it's run inside a PostgreSQL environment.

Answer 4

Apache age supports many set of window functions. As you mentioned rank, dense rank and ntile. You can further use these functions in your SQL queries which then performs calculations on set of rows.

1. Rank: Rank function is used to assign a new rank to each row inside a partition.
2. dense_rank: dense rank function does same work as rank with a little difference, lets suppose you have 2 rows with same values, the rows will receive same rank values, inshort the age gaps are avoided in dense ranking.
3. ntile(n): ntile funtion is used inside a partition, the rows in the partition are divided on basis of 'n' number provided by the user.

Answer 5

Using appacheAGE you can use all postgres functions normally, since apacheAGE is a postgres extention, and postgres supports many window functions as shown in the docs

Answer 6

You may utilise the window functions in apacheAGE as well as it is an extension for PostgreSQL and makes them available to you. An example of them will be using the rank() function, which is specified below:

SELECT depname, empno, salary,
       rank() OVER (PARTITION BY depname ORDER BY salary DESC)
FROM empsalary;

For more information regarding these window functions o PostgreSQL, you can refer to its documentation as well.

Answer 7

This might help you understand:

SELECT id, name, rank() OVER (ORDER BY score DESC) AS ranking
FROM your_table
ORDER BY score DESC
LIMIT 100;

The query retrieves the result set's id, name, score, and ranking columns. The ranking column represents the assigned rank for each row, indicating its relative position based on the score values.

Answer 8

Since Apache AGE is an extension built on top of PostgreSQL, it is compatible with all of the window functions that are offered by that database. You can use window functions to do calculations over a collection of rows. A simple example using the rank() function can be

SELECT employee_id, first_name, last_name, salary,
   RANK() OVER (ORDER BY salary DESC) AS salary_rank
FROM employees;

Answer 9

As Apache-Age is built on PostgreSQL. So, you can use all the functions with AGE that you can use with PostgreSQL.

Here you can see that how we can use it with PostgreSQL in the same way we can use it with AGE.

SELECT  first_name, last_name, salary,
   RANK() OVER (ORDER BY salary DESC) AS salary_rank
FROM employee;

I have an employee table after running above command here is result.

You can run these windows functions in AGE as well.

Answer 10

You can surely use these tools in Apache Age.

Think about the rank() tool. It helps give each row a position in a group, like a line, based on how you want them to be arranged.

SELECT id, name, score, rank() OVER (ORDER BY score DESC) AS ranking
FROM your_table;

The rank() tool works on the score numbers, and the answer becomes the rank in the result list. The ORDER BY part decides how things are ranked.

The answer will have the id, name, score, and ranking. The ranking shows how each row's score compares to others.

Answer 11

Yes, it is possible to use all Windows functions that are available in PostgreSQL in Apache AGE as well.

You can use the RANK function using the following line of code in your query.

SELECT id, name, RANK() OVER (ORDER BY <col_name> DESC) AS rankings
FROM <table_name>

Here <col_name> and <table_name> are just a placeholder, and you can replace them with the column and table name you want to apply ranking on.

Answer 12

Apache age support many set of windows functions, including rank dense_rank and ntile. You can use that function in your SQL queries to perform calculations on set of rows.

You can use this function like:

SELECT name, age, rank() OVER (ORDER BY age DESC) AS rank
FROM cypher('graph_name', $$ MATCH (p:Person) RETURN p.name AS name, p.age AS age       
$$) AS (name text, age int);

For more information you can read this official documentation from apache age:

https://age.apache.org/age-manual/master/functions/user_functions.html

Answer 13

Since, Apache AGE is an extension to Postgres, it is possible to use window functions like rank, dense_rank and ntile in apache age.

SELECT name, score, rank() OVER (ORDER BY score) AS pos FROM table;