In this tutorial, we will learn about the Data Types in Cassandra CQL language. DataTypes generally define the type of data a column can hold along with their own significance. CQL language supports the below list Data types:

1. Native Types
2. Collection Types
3. User-defined Types
4. tuple types

TYPE CONSTANTS DESCRIPTION
ascii string ASCII character string
bigint integer 64-bit signed long
blob blob Arbitrary bytes
boolean boolean Either true or false
counter integer Counter column
date integer, string A date (with no corresponding time value).
decimal integer, float Variable-precision decimal
double integer float 64-bit IEEE-754 floating point
float integer, float 32-bit IEEE-754 floating point
inet string An IP address
int integer 32-bit signed int
smallint integer 16-bit signed int
text string UTF8 encoded string
time integer, string A time with nanosecond precision
timestamp integer, string A timestamp with millisecond precision.
timeuuid uuid Version 1 UUID
tinyint integer 8-bit signed int
uuid uuid A UUID (of any version)
varchar string UTF8 encoded string
varint integer Arbitrary-precision integer

 

Collection Types

There are 3 types of collection datatypes :

1. Maps

Map is a set of Key-value pairs.Where keys are unique.

Example:

 

2. Sets

Set is collection of unique values.

Example:

 

3. Lists

List is a collection of non-unique values which can be ordered with their position.

Example:

 

User Defined Type

UDT can be created, modified and removed using below commands.

– CREATE TYPE
– ALTER TYPE
– DROP TYPE

Example:

 

Tuples

Tuples are a set of different types of elements.

Example: