Sets
A set is an unordered collection of distinct values. In Cassandra, sets are intended for
storing a small number of values of the same type. To define a set data type,
Cassandra Query Language provides construct SET<type>, where type can refer to a CQL data type like
INT, DATE, UUID and so forth.
✅ As an example, alter table movies to add column production of type SET<TEXT>:
ALTER TABLE movies ADD production SET<TEXT>;
SELECT title, year, production FROM movies;
✅ Add three production companies for one of the movies:
UPDATE movies
SET production = { 'Walt Disney Pictures',
'Roth Films' }
WHERE id = 5069cc15-4300-4595-ae77-381c3af5dc5e;
UPDATE movies
SET production = production + { 'Team Todd' }
WHERE id = 5069cc15-4300-4595-ae77-381c3af5dc5e;
SELECT title, year, production FROM movies;
✅ Next, alter table movies to add column genres and
add values Adventure, Family and Fantasy for one of the movies:
Solution
ALTER TABLE movies ADD genres SET<TEXT>;
UPDATE movies
SET genres = { 'Adventure', 'Family', 'Fantasy' }
WHERE id = 5069cc15-4300-4595-ae77-381c3af5dc5e;
SELECT title, year, genres FROM movies;