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Structured Query Language commonly known as SQL, is a standard language designed to interact with relational databases. It provides the ability to create, read, update, and delete operations, also known as CRUD operations. This blog will cover the basics of SQL with a focus on understanding database systems.
Understanding SQL
SQL makes interacting with databases using English like commands very easy. Most databases support SQL because it is simple yet powerful. Understanding the basics of SQL can set a strong foundation for grasping concepts related to interacting with database systems.
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/* A simple SQL statement to select all records from a table called Customers */ SELECT * FROM Customers |
Understanding Database Systems
A database system is a technology used to capture, store, manage and process data. It manages digital databases and allows users to perform multiple tasks with ease. SQL plays a key role in managing and running these systems due to its structured design and functionality.
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/* A simple SQL statement to insert into a table */ INSERT INTO Customers (CustomerName, ContactName, Address, City, PostalCode, Country) VALUES ('Cardinal','Tom B. Erichsen','Skagen 21','Stavanger','4006','Norway') |
Working with SQL
Working with SQL involves combining various commands to achieve desired outputs. This is commonly done using things like WHERE and AND/OR statements to filter and sort data, or JOIN clauses to combine multiple tables.
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/* A SQL statement using WHERE to filter results */ SELECT * FROM Customers WHERE Country='Mexico' |
Summary
SQL is a robust language designed for managing data held in a relational database management system (RDBMS). SQL’s simplicity and ubiquity across different database systems make it a fundamental skill for anyone interested in handling data. By mastering the fundamentals of SQL, you are laying a vital building block for your career in data analytics or any other data-driven fields.