How is data deletion implemented in Cassandra?

12 months ago

Noah Thompson

2 minutes

The deletion of data in Cassandra is achieved by using the DELETE statement in CQL (Cassandra Query Language). The DELETE statement can remove data rows that meet specified conditions.

For example, to delete data from a row in a table, you can use the following syntax:

DELETE FROM table_name WHERE condition;

In this case, table_name is the name of the table from which data will be deleted, and condition is a filtering criteria used to specify the data rows to be deleted. If no condition is specified, all data in the table will be deleted.

Furthermore, Cassandra also supports deleting data from an entire table or specific columns using the DELETE operation. For example, to delete data from an entire table, you can use the following syntax:

TRUNCATE table_name;

This will delete all data in the table while keeping the structure intact. If you only want to delete data from specific columns in the table, you can use the following syntax:

UPDATE table_name SET column_name = NULL WHERE condition;

This will set the values of the specified column to NULL, essentially deleting the data in that column.