PostgreSQL CRUD Tutorial for Beginners | SELECT, INSERT, UPDATE, DELETE | Day 23

In Day 23 of the 30-Day Real Software Development Skills Sprint, we learn the PostgreSQL basics every developer should know. We create a simple course platform database with two tables: courses enquiries Then we perform the four essential CRUD operations: INSERT to add data SELECT to read data UPDATE to modify data DELETE to remove data You will also understand primary keys, foreign keys, WHERE, ORDER BY, JOIN, and why forgetting the WHERE condition can accidentally update or delete every record. Even when developers use tools such as Prisma, Django ORM, SQLAlchemy, or TypeORM, basic SQL remains essential for debugging, checking production data, understanding queries, and improving API performance. Topics covered Introduction Why applications need databases Tables, rows, and columns Primary keys and foreign keys Creating the courses table Creating the enquiries table INSERT queries SELECT queries Joining courses and enquiries UPDATE queries DELETE queries Common SQL mistakes Why every developer should know SQL Daily task Practice task Create your own PostgreSQL database, add courses and enquiries tables, insert sample data, and perform one SELECT, INSERT, UPDATE, and DELETE operation. #PostgreSQL #SQL #Database #WebDevelopment #BackendDevelopment #ProgrammingForBeginners #SoftwareDevelopment #CRUD