Understanding Dense Rank

What is DENSE_RANK? DENSE RANK is a window function in SQL that is used to assign a rank to each row within a result set. The rank assigned to each row is based on the values in one or more columns specified in the ORDER BY clause. The DENSE RANK function is similar to the …

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LEAD and LAG Functions

LAG and LEAD are SQL analytic functions that allow you to access data from a previous or subsequent row in a query result set. LAG provides access to a previous row, while LEAD provides access to the following row. For example, imagine you have a table of sales data with columns for date, product, and …

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Working with Numpy

Numpy is a powerful library for mathematical computing and data manipulation in Python. It provides a robust and efficient array data structure for numerical computing, allowing for vectorized operations and efficient computation of mathematical operations on large datasets. With Numpy, you can perform a wide range of operations including statistical analysis, linear algebra, and signal …

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Working with Pandas

Pandas is a powerful and popular library for data analysis and manipulation in Python. It provides easy-to-use data structures and data analysis tools to handle, clean, and process large datasets. With its rich features, pandas makes it easier to explore, manipulate and transform data, making it the go-to tool for data engineers and data scientists. …

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Python Data Types

Tuple A tuple is a built-in data structure in Python that represents an ordered, immutable collection of elements. Here’s an example of how to create a tuple in Python: You can access elements in a tuple using indexing: Sets A set is a built-in data structure in Python that represents an unordered collection of unique …

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Getting Started – Before “Hello World”

Setting up a Python environment Let’s setup Python environment. Setting up a Python environment involves installing Python on your computer and configuring it to meet your needs. Here’e step-by-step procedure. Your First Python Script Let’s write every developer’s first (probably) program. Hello, World!

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