{"id":16139,"date":"2018-06-01T06:10:59","date_gmt":"2018-06-01T06:10:59","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=16139"},"modified":"2021-04-05T13:45:21","modified_gmt":"2021-04-05T08:15:21","slug":"cassandra-user-defined-types","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/cassandra-user-defined-types\/","title":{"rendered":"Cassandra User Defined Types- Create, Alter, Drop, Describe"},"content":{"rendered":"

1. Objective<\/h2>\n

In our previous Cassandra<\/a><\/strong> tutorial, we studied about data types<\/strong> used in Cassandra<\/strong><\/a>. In this article, we will know the Cassandra User Defined Types. While using a User Defined Type in Cassandra, we will also look at create, drop, alter and describe the function. <\/span><\/p>\n

Moreover, we will discuss\u00a0Cassandra user-defined types of\u00a0performance.<\/span><\/p>\n

So, let’s discuss Cassandra User Defined Types in detail.<\/p>\n

\"Cassandra<\/a>

Cassandra User Defined Types<\/p><\/div>\n

2. Cassandra User Defined Types<\/h2>\n

As the name suggests, the user has the ability to define certain data types. Cassandra Query Language allows the user to do so. The user may create, alter, drop or describe a data type. <\/span><\/p>\n

The data types can be according to the user’s requirement as according to the program or field. Let’s discuss it more.<\/span>
\nDo you know about Cassandra Collection Data Types<\/a><\/strong><\/p>\n

a. Create<\/h3>\n

CQL allows the user to create data types. The user can create the data type using this syntax:<\/span><\/p>\n

CREATE TYPE <keyspace>.<data type>\r\n(variable,variable).<\/pre>\n
Here, the user has to make sure that the name used for user-defined data type and predefined data type are not the same. <\/span>
\nLet’s create a cassandra\u00a0<\/span>user-defined data type. In the example, we will create ‘records’ for college students with following field name and field type.<\/span>
\nTable.1 Cassandra User Defined Types – Create<\/strong><\/p>\n\n\n\n\n\n\n\n\n
FIELD NAME<\/span><\/td>\nFIELD TYPE<\/span><\/td>\nDESCRIPTION<\/span><\/td>\n<\/tr>\n
Name<\/span><\/td>\nText<\/span><\/td>\nName of the student.<\/span><\/td>\n<\/tr>\n
Branch<\/span><\/td>\nText<\/span><\/td>\nMajor of the degree.<\/span><\/td>\n<\/tr>\n
Phone<\/span><\/td>\nInt<\/span><\/td>\nPhone number.<\/span><\/td>\n<\/tr>\n
City<\/span><\/td>\nText<\/span><\/td>\nCity they are from.<\/span><\/td>\n<\/tr>\n
Id<\/span><\/td>\nint<\/span><\/td>\nEnrolment number<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Learn\u00a0Cassandra Architecture a Complete Guide<\/a><\/strong>
\nExample 1:<\/strong> Creating the data type.<\/span>
\nInput:<\/strong><\/p>\n
cqlsh:keyspace1> CREATE TYPE records (\r\n                         ... name text,\r\n                         ... branch text,\r\n                         ... phone int,\r\n                         ... city text,\r\n                         ... id set <int>,\r\n                         ... );\r\n<\/pre>\n
b. Alter<\/h3>\n
After creating the data type in cassandra, a user also has an option to alter the contents. The user can add and rename fields of the data type.<\/span>
\nTo add a field in a data type, the user can use ALTER TYPE along with ADD command. The syntax is<\/span><\/p>\n
ALTER TYPE <data type>\r\nADD <field name><field type>;<\/pre>\n
Example 2:<\/strong> Adding field email to the data type.<\/span>
\nInput:<\/strong><\/p>\n
ALTER TYPE records\r\nADD email text;<\/pre>\n
If the user wants to rename a field, he can use ALTER TYPE along with RENAME command. The syntax to rename is.<\/span><\/p>\n
ALTER TYPE<data type>\r\nRENAME<existing name>TO<new name>;<\/pre>\n
Example 3:<\/strong> Changing the name of field ‘id’ to ‘en’.<\/span>
\nCassandra Data Model | How Cassandra Stores Data<\/a><\/strong>
\nInput:<\/strong><\/p>\n
ALTER TYPE records\r\nRENAME id TO en;<\/pre>\n
c. Drop<\/h3>\n
Using DROP TYPE command user can drop or delete a Cassandra user-defined data type. The user can use syntax given below.<\/span><\/p>\n
cqlsh:<keyspace>>DROP TYPE <data type><\/pre>\n
Example 4:<\/strong> Dropping the field ‘city’.<\/span>
\nInput:<\/strong><\/p>\n
cqlsh:keyspace1> DROP TYPE city;<\/pre>\n
d. Describe<\/h3>\n
The user can verify the contents of the data type by using DESCRIBE TYPE command. The syntax used for this is.<\/span><\/p>\n
cqlsh:<keyspace>> DESCRIBE TYPE<data type>;\r\n<\/pre>\n
Input:<\/strong><\/p>\n
cqlsh:keyspace1> DESCRIBE TYPE records;<\/pre>\n
Output after Example 1:<\/strong>
\nCREATE TYPE<\/span> keyspace1.records<\/span>(<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… name <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… branch <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… phone <\/span>int,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… city <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… id <\/span>set <int>,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… <\/span>);<\/span>
\nOUTPUT after Example 2:<\/strong>
\nCREATE TYPE <\/span>keyspace1.records<\/span>(<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… name <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… branch <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… phone <\/span>int,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… city <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… id <\/span>set <int>,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… email <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… <\/span>);<\/span>
\nLet’s explore\u00a0<\/a>Cassandra Features<\/a> <\/strong>
\nOUTPUT after Example 3:<\/strong>
\nCREATE TYPE<\/span> keyspace1.records<\/span>(<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… name <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… branch <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… phone <\/span>int,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… city <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… en <\/span>set <int>,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… email <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… <\/span>);<\/span>
\nOUTPUT after Example 4:<\/strong>
\nCREATE TYPE<\/span> keyspace1.records<\/span>(<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… name <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… branch <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… phone <\/span>int,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… en <\/span>set <int>,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… email <\/span>text,<\/span>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0… <\/span>);<\/span><\/p>\n
How much you learned about Cassandra – Test Here<\/a><\/strong>
\nSo, this was all about Cassandra User Defined Types. Hope You like our explanation.<\/p>\n
3. Conclusion<\/h2>\n
Hence, in this article, we got to know about the Cassandra User Defined Data Types. Moreover, we also studied create, alter, drop and describe the user-defined types of Cassandra. In the next article, we will study about troubleshooting in Cassandra<\/a><\/strong>. <\/span><\/p>\n
Furthermore, if you have any query regarding Cassandra user defined types, feel free to ask through the comment section.<\/span>
\nSee also –<\/strong>
\nCassandra Interview Questions<\/b><\/a>
\nFor reference<\/strong><\/a>
1. Objective In our previous Cassandra tutorial, we studied about data types used in Cassandra. In this article, we will know the Cassandra User Defined Types. While using a User Defined Type in Cassandra,...<\/p>\n","protected":false},"author":7,"featured_media":16143,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[431,2398,3069,3775,4065,15226],"class_list":["post-16139","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cassandra","tag-alter-in-cassandra","tag-cassandra-user-defined-types","tag-create-in-cassandra","tag-describe-in-cassandra","tag-drop-command-in-cassandra","tag-user-defined-types-in-cassandra"],"yoast_head":"\nCassandra User Defined Types- Create, Alter, Drop, Describe - DataFlair<\/title>\n<meta name=\"description\" content=\"Cassandra CQL User Defined Types, Create, Alter, Drop, Describe, Cassandra User defined types performance, Example and Code\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/cassandra-user-defined-types\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cassandra User Defined Types- Create, Alter, Drop, Describe - 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