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In this post, we will learn how to work with multiple databases using SQL. This is a useful skill for data analysts, DBA, developers, and anyone who wants to manipulate data from different sources. We will cover the following topics: Database Management Systems (DBMS) Connecting to Multiple Databases Data Migration This post is part of the SQL Learning Series, a collection of articles that will teach you the basics and advanced features of SQL. If you want to learn more about SQL, you can check out the previous posts in the series here. Database Management Systems (DBMS): A database is a collection of data that is organized in a structured way. A database can store information such as tables, records, fields, indexes, views, etc. A database can also have rules and constraints that define how the data can be accessed and manipulated. A database management system (DBMS) is a software that allows users to create, manage, and interact with databases. A DBMS provides features such as data s

SQL is a powerful and popular language for querying and manipulating data in relational databases. However, writing efficient and fast SQL queries is not always easy. Sometimes, a poorly written query can cause performance issues, such as slow response time, high resource consumption, and poor user experience. Therefore, it is important to learn how to optimize SQL queries and improve their performance. In this blog post, we will cover some of the basic concepts and techniques of SQL performance optimization, such as indexing, query optimization, and explain plan. We will also provide some examples and references for further learning. This post is part of the SQL Learning Series, where we aim to teach you the fundamentals and best practices of SQL in a simple and practical way. If you are interested in learning more about SQL, please follow me on Medium and  LinkedIn , and check out the other posts in this series. What is SQL Performance Optimization? SQL performance optimization is th