CQL

Create KeySpace

( same as db in SQL )

CREATE KEYSPACE mykeyspace WITH REPLICATION = { 
		'class' : 'NetworkTopologyStrategy', 
		'replication_factor' : 3
};
	
use mykeyspace;

DESCRIBE mykeyspace;

CREATE TABLE users ( 
	user_id int, 
	fname text, 
	lname text, 
	PRIMARY KEY((user_id))
); 

Create Table & Insert Data

CREATE TABLE users ( 
	user_id int, 
	fname text, 
	lname text, 
	PRIMARY KEY((user_id))
); 

insert into users(user_id, fname, lname) values (1, 'rick', 'sanchez'); 
insert into users(user_id, fname, lname) values (4, 'rust', 'cohle'); 

select * from users;

CONSISTENCY QUORUM | ALL

More Queries

SELECT * from 
    heartrate_v1 
WHERE 
    pet_chip_id = 123e4567-e89b-12d3-a456-426655440b23;
    
DELETE FROM 
    heartrate_v1 
WHERE 
    pet_chip_id = 123e4567-e89b-12d3-a456-426655440b23;

All inserts in Scylla DB (and Cassandra) are actually upserts (insert/update). There can be only one set of values for each unique primary key. If we insert again with the same primary key, the values will be updated.

Data Modelling

Data Types | Scylla Docs

Map

CREATE TABLE pets_v1 (
    pet_chip_id text PRIMARY KEY,
    pet_name text,
    favorite_things map<text, text> // A map of text keys, and text values
);

INSERT INTO pets_v1 (pet_chip_id, pet_name, favorite_things)
           VALUES ('123e4567-e89b-12d3-a456-426655440b23', 
           'Rocky', { 'food' : 'Turkey', 'toy' : 'Tennis Ball' });

Set

CREATE TABLE pets_v2 (
    pet_name text PRIMARY KEY,
    address text,
    vaccinations set<text> 
);

INSERT INTO pets_v2 (pet_name, address, vaccinations)
            VALUES ('Rocky', '11 Columbia ave, New York NY', 
            { 'Heartworm', 'Canine Hepatitis' });

List

CREATE TABLE pets_v3 (
    pet_name text PRIMARY KEY,
    address text,
    vaccinations list<text>
);

INSERT INTO pets_v3 (pet_name, address, vaccinations)
            VALUES ('Rocky', '11 Columbia ave, New York NY',  
            ['Heartworm', 'Canine Hepatitis', 'Heartworm']);