SQL injections are a category of web application security vulnerabilities that can affect both relational databases and NoSQL data stores.
How security flaws work: SQL injection is an approachable primer on the history and danger of how unsanitized inputs to a database work.
Preventing SQL injections provides a PostgreSQL and psycopg2 example for how to avoid getting bit by a SQL injection vulnerability.
Securing your site like it's 1999 covers a bunch of common web application vulnerabilities including SQL injection.
Automating Blind Sql Injection shows how to use Python to execute SQL injection on the example Damn Vulnerable Web Application project.
The automatic transcription API loved by Python developers.