Database Video Notes: A Comprehensive Guide
This article provides an in-depth overview of SQL statements, database structures, and data manipulation language. Key takeaways include:
* SQL can be divided into two categories: Data Manipulation Language (DML) and Data Definition Language (DDL)
* DML statements are used for queries, inserting, and modifying data
* Optimizer calculates the optimal execution plan for a query
* GROUP functions can produce interim/temporary answer sets
* Joins can create Cartesian products if not properly qualified with WHERE clause
The article also covers various database structures, including tables, views, and indexes. Additionally, it touches on constraints, triggers, and templates.