What is the method to delete data in Cassandra?

Cassandra has multiple ways to delete data:

1. To delete data in Cassandra, you can use the DELETE statement in CQL (Cassandra Query Language). This statement allows you to delete data based on the row key (Primary Key) or specific columns. For example, you can use the following statement to delete data with a specified row key:
2. Remove the row from the table where the primary key column matches the specified value.
3. You can also delete data from a specific column using the following statement:
4. Remove the column_name from table_name where the primary_key_column has the specified value.
5. Batch deletion: Cassandra allows for batch deletion operations, where multiple rows can be deleted at once. This can be done using the BATCH statement in CQL. For example:
6. Delete from the table where the primary key column equals the specified value and then apply the changes.
7. In the above example, the two DELETE statements will be executed in the same BATCH.
8. Cassandra also offers a command line tool called cqlsh for executing delete operations. We can use the DELETE command to delete data. For example:
9. Remove from table_name in keyspace_name where primary_key_column equals value.
10. In the example above, keyspace_name refers to the name of the keyspace, table_name refers to the name of the table, and primary_key_column refers to the name of the primary key column.

Regardless of the method used, the deletion operation is always based on the primary key of the table. Therefore, before performing a deletion operation, it is important to ensure that the correct primary key is specified in the table definition.