steps to install cassandra:
1)Pull the Cassandra Docker Image: cmnd (docker pull cassandra:latest)
2)Run cassandra in docker:(docker run --name cassandra-db -p 9042:9042 -d cassandra)
3)Checking if cassandra is running or not: (docker ps)

Now access the cassandra database shell inside docker container:-
1)Accessing shell: (docker exec -it cassandra-db cqlsh)
2)Describe keyspaces (database): (describe keyspaces;)
3)Create keyspace: (create keyspaces db-name with replication={'class':'SimpleStrategy','replication_factor':1};)
4)Use the keyspace(database): (use db-name;)
5)Create table: (create table employee(id UUID PRIMARY KEY, name text, age int);)
6)Insert data: (INSER INTO employee(id, name, age) VALUES (uuid(),'ABC', 20);)
7)Fetch data: (select * from employee;)
8)Update data: (UPDATE employee SET name = 'new-value' WHERE id = 123e4567-e89b-12d3-a456-426614174000 AND created_at = '2025-01-01 10:00:00';)
9)Delete data: (DELETE FROM employee WHERE id = 123e4567-e89b-12d3-a456-426614174000 AND created_at = '2025-01-01 10:00:00';)