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.
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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 |
Collection Types
Cassandra Query Language also provides a collection of 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 data types:
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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