The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear implacability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple data centers is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages.
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.
These core tutorials will help you to learn the CQL Datatypes in Cassandra . For an in-depth understanding andpractical experience, explore Cassandra Training Online.
The following table provides a list of built-in data types available in CQL.
Data Types
| 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 |
| UUID | ||
| varchar | strings | Represents uTF8 encoded string |
| varint | integers | Represents arbitrary-precision integer |
Learn more about Cassandra Interview Questions in this blog post.
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.
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