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Operators in Python are symbols that allow you to perform operations on variables and values. They are essential for manipulating data and controlling program flow. Python provides a wide range of operators categorized into different types.

Before we dive into Type Casting, it's crucial to understand data types. In Python, everything is an object, and each object has a data type. The common data types include integers, floats, strings, and more. Type Casting becomes essential when we need to convert data from one type to another.

MySQL is one of the most popular relational database management software that is widely used in today's industry. It provides multi-user access support with various storage engines. It is backed by Oracle Company.

Aggregate functions are SQL functions that operate on a set of values and return a single, summarized result. They are commonly used to perform calculations on a group of records rather than individual rows.

Joining tables is akin to piecing together a puzzle. It involves combining data from two or more tables based on specific criteria. This process allows us to extract meaningful information from the interconnected tables, leading to more insightful data analysis.