SQL injection is a code injection technique that exploits a security vulnerability within the database layer of an application. This vulnerability can be found when user input is incorrectly filtered for string literal escape characters embedded in SQL statements.
Although SQL injection is most commonly used to attack websites, it can also be used to attack any SQL database. Last year, a security company reported that the average web application is attacked at least four times per month by SQL injection techniques. Online retailers receive more attacks than any other industry with an online presence.
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