Structured Query Language (SQL) is a powerful tool used to interact with relational databases. Whether you're a beginner or an experienced developer, understanding the basics of SQL is essential for working with data.
In this beginner's guide, we'll cover the fundamental concepts of SQL and how to use it to manipulate and retrieve data. Let's get started!
SQL is a domain-specific language used to manage and manipulate data stored in relational databases. SQL is used for data manipulation, data retrieval, and data definition. It is the standard language for managing and working with relational databases.
SQL is made up of a series of commands used to manipulate and retrieve data. Here are some of the most commonly used SQL commands:
Let's take a look at some basic SQL statements to give you an idea of how SQL works.
SELECT statement:
SELECT * FROM customers;
This statement selects all columns from the "customers" table.
INSERT statement:
INSERT INTO customers (first_name, last_name, email)
VALUES ('John', 'Doe', 'johndoe@email.com');
This statement inserts a new row into the "customers" table with the values "John", "Doe", and "johndoe@email.com" in the "first_name", "last_name", and "email" columns, respectively.
UPDATE statement:
UPDATE customers
SET email = 'newemail@email.com'
WHERE id = 1;
This statement updates the "email" column in the "customers" table where the "id" is equal to 1.
DELETE statement:
DELETE FROM customers
WHERE id = 1;
This statement deletes the row from the "customers" table where the "id" is equal to 1.
SQL is a powerful tool for managing and working with relational databases. In this beginner's guide, we covered the basics of SQL, including its commands and basic statements. With this knowledge, you'll be well on your way to working with data in a relational database.
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Categories : MySQL
Tags : MySQL code examples SQL structured query language relational databases
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