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SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.
Some of The Most Important SQL Commands. SELECT - extracts data from a database. UPDATE - updates data in a database. DELETE - deletes data from a database. INSERT INTO - inserts new data into a database. CREATE DATABASE - creates a new database. ALTER DATABASE - modifies a database. CREATE TABLE - creates a new table.
Basic Structure of SQL Commands. Most SQL commands follow this simple structure: ACTION what_to_do FROM where_to_do_it WHERE conditions; Let's break this down: ACTION: What you want to do (e.g., SELECT, INSERT, UPDATE) what_to_do: What you want to act on (e.g., column names) FROM: The table you're working with.
Learn the basics of writing accurate SQL statements, including using keywords, clauses, operators, and functions to query and manipulate data in a relational database. Get step-by-step guidance on how to use SELECT, INSERT, UPDATE, DELETE, and other clauses.
This tutorial provides an overview of the most commonly used SQL commands to create, alter, and manipulate tables and data in databases.
The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set. SELECT Syntax. SELECT column1, column2, ... FROM table_name; Here, column1, column2, ... are the field names of the table you want to select data from.
Some of The Most Important SQL Commands. SELECT - extracts data from a database. UPDATE - updates data in a database. DELETE - deletes data from a database. INSERT INTO - inserts new data into a database. CREATE DATABASE - creates a new database. ALTER DATABASE - modifies a database. CREATE TABLE - creates a new table.
