Chapter 15: Create Demo Database
create a complete demo database from scratch! ☕🎬 Up to now we’ve been building tiny pieces (one table → few rows → simple queries). Today we build a realistic mini-project database that feels like...
Category: PostgreSQL
Chapter 14: PostgreSQL DROP TABLE
PostgreSQL DROP TABLE ☕💥 You’ve already learned: CREATE TABLE INSERT, SELECT, UPDATE, DELETE ALTER TABLE … ADD / ALTER / DROP COLUMN Now comes the command that says: “I no longer want this table...
Chapter 13: PostgreSQL DELETE
PostgreSQL: DELETE ☕🗑️ You’ve already learned how to: Create tables Insert rows Select / read data Update existing rows Add, alter, drop columns Now comes DELETE — the command that permanently removes rows from...
Chapter 12: PostgreSQL DROP COLUMN
PostgreSQL DROP COLUMN ☕🗑️ You’ve already learned how to: Create tables Add columns Modify columns (ALTER COLUMN) Update data Now comes the opposite direction: removing a column you no longer need (maybe it was...
Chapter 11: PostgreSQL ALTER COLUMN
PostgreSQL ALTER COLUMN — one of the most frequently used (and sometimes most nerve-wracking) commands when your database schema needs to evolve after data is already inside. You’ve already learned: CREATE TABLE INSERT SELECT...
Chapter 10: PostgreSQL UPDATE
PostgreSQL UPDATE ☕✏️ You’ve already: Created tables Inserted rows Selected / read data Added columns to existing tables Now the real world hits: students change phone numbers, GPAs get updated after revaluation, enrollment status...
Chapter 9: PostgreSQL ADD COLUMN
PostgreSQL ADD COLUMN ☕🛠️ You’ve already: Created tables (CREATE TABLE) Inserted data (INSERT) Queried data (SELECT) Now your app or project evolves → you realize “Oh no, I forgot to store the student’s phone...
Chapter 8: PostgreSQL Select Data
PostgreSQL SELECT Data ☕🔍 You’ve already: Created databases & tables (CREATE TABLE) Put data inside (INSERT) Now we learn how to ask questions and get data back — that’s what SELECT is all about....
Chapter 7: PostgreSQL Insert Data
1. What does INSERT actually do? (Teacher’s simple explanation) INSERT is the SQL command that says: “PostgreSQL, please add one or more new rows of data into this specific table. Here’s the values for...
Chapter 6: PostgreSQL Create Table
1. What does CREATE TABLE actually do? (Honest teacher explanation) CREATE TABLE tells PostgreSQL: “Hey, make me a new, initially empty table inside the current database. Give it this name, these columns with these...
