This chapter explains the four basic database operations (CRUD), and the transactions and ACID properties (atomicity, consistency, isolation, durability) that handle multiple operations as a unit, using examples like bank transfers.
This chapter explains, for junior engineers, the basic concept of a relational database (RDB), the benefits and trade-offs of managing data as "multiple related tables" instead of "one giant table," and how to choose between RDB and NoSQL.
This chapter explains, for junior engineers, the role of a DBMS (SQL parsing, transaction management, permissions, optimization), the four categories of SQL (DDL/DML/DCL/TCL), and the characteristics and trade-offs of major RDBMS products (PostgreSQL / MySQL / SQLite / Oracle / SQL Server).