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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. Start learning SQL now ».
SQL Statement. Syntax. AND / OR. SELECT column_name (s) FROM table_name. WHERE condition. AND|OR condition. ALTER TABLE. ALTER TABLE table_name.
SQL stands for Structured Query Language. SQL lets you access and manipulate databases. SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987.
MySQL is a widely used relational database management system (RDBMS). MySQL is free and open-source. MySQL is ideal for both small and large applications. Start learning MySQL now ». Examples in Each Chapter. With our online MySQL editor, you can edit the SQL statements, and click on a button to view the result.
A database most often contains one or more tables. Each table is identified by a name like "Customers" or "Orders". Below is a selection from a "Customers" table: ID. CustomerName. ContactName.
You are now using a light-version of the Try-SQL Editor, with a read-only Database. If you switch to a browser with WebSQL support, you can try any SQL statement, and play with the Database as much as you like. The Database can also be restored at any time.
SQL Data Types. Each column in a database table is required to have a name and a data type. An SQL developer must decide what type of data that will be stored inside each column when creating a table. The data type is a guideline for SQL to understand what type of data is expected inside of each column, and it also identifies how SQL will ...
The SELECT TOP clause is used to specify the number of records to return. The SELECT TOP clause is useful on large tables with thousands of records. Returning a large number of records can impact performance.
Learn SQL. Start your data management journey by learning SQL, the foundation of database interaction. SQL is great for analyzing and handling structured data, and is essential knowledge for backend development and data analysis.
The following SQL creates an index named "uidx_pid" on the "PersonID" column in the "Persons" table: CREATE UNIQUE INDEX uidx_pid ON Persons (PersonID); CREATE VIEW. The CREATE VIEW command creates a view. A view is a virtual table based on the result set of an SQL statement.
