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, …

SQL is a Standard - BUT.... Although SQL is an ANSI/ISO standard, there are different versions of the SQL language. However, to be compliant with the ANSI standard, they all support at least the major …

The SQL SELECT DISTINCT Statement The SELECT DISTINCT statement is used to return only distinct (unique) values. In a table, a column may contains many duplicate values - and sometimes …

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SQL Injection SQL injection is a code injection technique that can destroy your database. SQL injections are a common web hacking technique. SQL injections are when attackers insert malicious SQL code …

SQL Wildcard Characters A wildcard character is used to substitute one or more characters in a string. Wildcard characters are used with the LIKE operator. The LIKE operator is used in a WHERE clause …

The SQL CASE Expression The CASE expression is used to define different results based on specified conditions in an SQL statement. The CASE expression goes through the conditions and stops at the …

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Introduction: SQL is a standard language for storing, manipulating and retrieving data in databases. W3Schools offers an SQL training course that covers SQL foundations and more. The course …

The SQL MAX () Function The MAX() function returns the largest value of the selected column. The MAX() function works with numeric, string, and date data types.