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SQL Query: 3 Methods for Calculating Cumulative SUM

SQL provides various constructs for calculating cumulative sums, offering flexibility and efficiency in data analysis. In this article, we explore three distinct SQL queries that facilitate the computation of cumulative sums. Each query leverages different SQL constructs to achieve the desired outcome, catering to diverse analytical needs and preferences. Using Window Functions (e.g., PostgreSQL, SQL Server, Oracle) SELECT id, value, SUM(value) OVER (ORDER BY id) AS cumulative_sum  FROM your_table; This query uses the SUM() window function with the OVER clause to calculate the cumulative sum of the value column ordered by the id column. Using Subqueries (e.g., MySQL, SQLite): SELECT t1.id, t1.value, SUM(t2.value) AS cumulative_sum FROM your_table t1 JOIN your_table t2 ON t1.id >= t2.id GROUP BY t1.id, t1.value ORDER BY t1.id; This query uses a self-join to calculate the cumulative sum. It joins the table with itself, matching rows where the id in the first table is greater than or

How to Find Folder Space in Linux Easily

Here's an example that shows how to use find command to get directory utilized space in Linux. Many of a time during production support, or when crontab jobs failed, the reasons behind is space shortage of a directory.

Folder space

The find is handy you can use to get utilized space of a directory. That helps you to delete unnecessary files (that actually make some space).

Linux find command

Here's the find command that I have used in our project. You will find here the detailed explanation of this command and how to use it.

find /home/srini -xdev -ls | sort +6rn | head -20

Part#1: Directory path

In the first part,  after the find you need to give the directory's path for which folder you are going to find space.

Part#2: Option -xdev

The second part is -xdev, which gives the space usage of all the subdirectories.

Part#3: Option -ls

The next part is the -ls option that provides a sorted list of all the subdirectories. 

Part#4: Sort command

Then, the sort command sorts based on the value +6rn.

Sort options

-n Sort numerically (10 will sort after 2), ignore blanks and tabs 
-r Reverse the order of sort 
-f Sort upper- and lowercase together 
+x Ignore first x fields when sorting

Part#5: Option +xrn

The value +6 states to ignore 6 columns in the sort. The option +rn sorts in descending order of memory.

Sort command

Part#6: Option head -20

The head -20 gets the top 20 rows of directories details.

The command you can use to find the folders which takes more space.

Tip#1 I have gone through the best books and Udemy courses. I am giving here for your reference. Here is the book on Bash scripting and Udemy course is Bash Mastery helpful to know more.


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