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

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; ALTER TABLE - …

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.

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 interact with the stored data. Note: Data types might have different names in different database.

Example Explained. SQL SELECT. SELECT Column SELECT * Examples Explained. SQL SELECT DISTINCT. SELECT DISTINCT. Examples Explained. SQL WHERE. WHERE Clause Text Fields vs. Numeric Fields. Examples Explained. SQL AND, OR and NOT Operators. ... SQL Database. SQL Database tutorials can be found here:

SQL Statement Syntax; AND / OR: SELECT column_name(s) FROM table_name WHERE condition AND|OR condition: ALTER TABLE: ALTER TABLE table_name ADD column_name datatype. or. ALTER TABLE table_name DROP COLUMN column_name: AS (alias) SELECT column_name AS column_alias FROM table_name. or. SELECT column_name FROM table_name AS table_alias: BETWEEN ...

SQL injection is a code injection technique that might destroy your database. SQL injection is one of the most common web hacking techniques. SQL injection is the placement of malicious code in SQL statements, via web page input.

The SQL CASE Expression. The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it …

RDBMS is a program used to maintain a relational database. RDBMS is the basis for all modern database systems such as MySQL, Microsoft SQL Server, Oracle, and Microsoft Access. RDBMS uses SQL queries to access the data in the database.

MySQL is the de-facto standard database system for web sites with HUGE volumes of both data and end-users (like Facebook, Twitter, and Wikipedia). Another great thing about MySQL is that it can be scaled down to support embedded database applications.