SQL Injection Walkthrough – SQL injection attacks web applications by submitting raw SQL queries as input. Includes what to look for, how to test if a page is vulnerable, how to execute commands remotely, how to see the output of your SQL query, how to get data from the database using ODBC error messages, how to update/insert data into the database, and how to avoid SQL Injection.
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Source: https://packetstormsecurity.com/files/26122/sql_injection_walkthrough.txt.html