This document provides details on connecting to a Cassandra instance in EC2 cloud using Putty and performing various operations like listing keyspaces, working in a keyspace, describing and creating tables, inserting and retrieving records, deleting records, truncating tables, dropping tables and keyspaces, and using indexes. It also includes examples of creating a sample Facebook project with a UserProfiles table and updating records.

1. Cassandra Tutorials – Working in EC2 Cloud:Putty Details:Host name: dev-use1b-pr-33-huginn-dev-0002.prv-openclass.com
IP of Cassandra Instance:10.199.240.220
CONNECT TO CASSANDRA INSTANCE:-
 cqlsh10.199.240.220
using putty.
- To connect to Cassandra instance 10.199.240.220 in EC2 Cloud
LIST OF ALL KEYSPACES: Select * from system.system.schema_keyspaces;To get info of all existing keyspaces.
Here system is a reserve Cassandra keyspace.
WORK IN KEYSPACE: USE sunil_keyspace; To use particular keyspace;

2. DESCRIBE KEYSPACE: Describe keyspacesunil_keyspace; To describe particular keyspace
CREATE TABLE: create table users (user_idvarchar, age int, email varchar, city varchar, PRIMARY KEY (user_id));
INSERT RECORDS IN TABLE: insert into users (user_id, age, email, city) values (‘jsmith’, 32,
‘john.smith@example.com’,’Dallas’); To insert records to the table
META DATA OF TABLE: describe table users; To get meta data info for particular table.

3. RECORDS OF TABLE: select * from users; To retrieve records from particular table.
STRUCTURE OF USERS TABLE:Key Concept:Below is representation of how users table is stored in Cassandra database. KEyspace is
container and Table has each rows associated with a primary key. Important point is that a row may
contain varied columns as shown in picture.

4. DELETE RECORDS OR PARTICULAR COLUMN: delete email from users where user_id=’sunilk’; This deletes email column from sunilk row in
users table. We can see that they appear as null.
 select from users where user_id=’sunilk’; Deletes entire row.

5. TRUNCATE:
 truncateusers; To delete all records of particular table. But meta data of table is still present.
DROP TABLE AND KEYSPACE:
 drop table users; To delete both records and meta data. No trace of meta data nor records is
found.

6. Sample Facebook Project: Create facebookkeyspace and use facebookkeyspace.
Complete list of CQL Data types:-

7.  Create UserProfiles table with following records or rows as seen below.
 Updating record of Angela Thomas setting age to 20 and profile picture to 0x5d1b.
 For retrieving particular row of table.
INDEXES:For non-indexed columns, no output is returned on query. Below is indexing command.

8. ALTER TABLE AND USAGE OF COLLECTION DATATYPES:-