PostgreSQL

Suppose we have this table employees: id name email salary 1 Alice Johnson alice.johnson@example.com 60000 2 Bob Smith bob.smith@example.com 55000 […]

Deleting Columns from Tables in PostgreSQL (DROP COLUMN) Syntax ALTER TABLE table_name DROP COLUMN column_name [CASCADE | RESTRICT]; Explanation: table_name:

Suppose we have the table employees initially like this: Column Data Type Constraints id SERIAL PRIMARY KEY name VARCHAR(100) NOT

Syntax UPDATE table_name SET column1 = value1, column2 = value2, … WHERE condition; Suppose we have this table employees: id

Suppose we have a table named employees with these columns: Column Data Type id SERIAL PRIMARY KEY name VARCHAR(100) email

1. Syntax SELECT column1, column2, … FROM table_name WHERE condition ORDER BY column ASC|DESC LIMIT number; 2. Suppose We Have

Syntax INSERT INTO table_name (column1, column2, …) VALUES (value1, value2, …); Explanation: table_name: Name of the table to insert data

CREATE TABLE Syntax CREATE TABLE table_name ( column1 datatype [constraints], column2 datatype [constraints], … ); Explanation: table_name: Name of the

1. Syntax to Create a Database CREATE DATABASE database_name; What it does: This command creates a new database named database_name