Cassandra - CQL Datatypes

CQL provides a rich set of built-in data types, including collection types. Along with these data types, users can also create their own custom data types. The following table provides a list of built-in data types available in CQL.

Data Type Constants Description
ascii strings Represents ASCII character string
bigint bigint Represents 64-bit signed long
blob blobs Represents arbitrary bytes
Boolean booleans Represents true or false
counter integers Represents counter column
decimal integers, floats Represents variable-precision decimal
double integers Represents 64-bit IEEE-754 floating point
float integers, floats Represents 32-bit IEEE-754 floating point
inet strings Represents an IP address, IPv4 or IPv6
int integers Represents 32-bit signed int
text strings Represents UTF8 encoded string
timestamp integers, strings Represents a timestamp
timeuuid uuids Represents type 1 UUID
uuid uuids Represents type 1 or type 4
varchar strings Represents uTF8 encoded string
varint integers Represents arbitrary-precision integer

Collection Types

Cassandra Query Language also provides a collection data types. The following table provides a list of Collections available in CQL.

Collection Description
list A list is a collection of one or more ordered elements.
map A map is a collection of key-value pairs.
set A set is a collection of one or more elements.

User-defined datatypes

Cqlsh provides users a facility of creating their own data types. Given below are the commands used while dealing with user defined datatypes.

  • CREATE TYPE − Creates a user-defined datatype.

  • ALTER TYPE − Modifies a user-defined datatype.

  • DROP TYPE − Drops a user-defined datatype.

  • DESCRIBE TYPE − Describes a user-defined datatype.

  • DESCRIBE TYPES − Describes user-defined datatypes.