CS50 Fall 2023 - Lecture 7 - SQL (live, unedited)

In this CS50 lecture, the speaker introduces SQL as a database-centric language, emphasizing its importance for web and mobile programming. The lecture includes a live data collection activity using Google Forms to demonstrate data analysis in Python, covering CSV file manipulation, dictionary usage for data counting, and sorting techniques. The speaker transitions to SQL, explaining its CRUD paradigm and demonstrating basic SQL commands like CREATE TABLE, SELECT, INSERT, UPDATE, and DELETE using SQLite. The lecture further explores real-world database concepts with a dataset from the Internet Movie Database (IMDB), discussing table relationships (one-to-one and one-to-many), primary and foreign keys, and the use of JOIN for querying related data across multiple tables. The session concludes by addressing performance issues with indexing and security vulnerabilities like SQL injection attacks, advocating for the use of placeholders to prevent malicious input.