TRUNCATE

Synopsis

Use the TRUNCATE statement to remove all rows from a specified table.

Syntax

Diagram

TRUNCATETABLEtable_name

Grammar

truncate ::= TRUNCATE [ TABLE ] table_name;

Where

  • table_name is an identifier (possibly qualified with a keyspace name).

Semantics

  • An error is raised if the specified table_name does not exist.

Examples

Truncate a table

ycqlsh:example> CREATE TABLE employees(department_id INT,
                                      employee_id INT,
                                      name TEXT,
                                      PRIMARY KEY(department_id, employee_id));

ycqlsh:example> INSERT INTO employees(department_id, employee_id, name) VALUES (1, 1, 'John');

ycqlsh:example> INSERT INTO employees(department_id, employee_id, name) VALUES (1, 2, 'Jane');

ycqlsh:example> INSERT INTO employees(department_id, employee_id, name) VALUES (2, 1, 'Joe');

ycqlsh:example> SELECT * FROM employees;

 department_id | employee_id | name
---------------+-------------+------
             2 |           1 |  Joe
             1 |           1 | John
             1 |           2 | Jane

Remove all rows from the table.

ycqlsh:example> TRUNCATE employees;

ycqlsh:example> SELECT * FROM employees;

 department_id | employee_id | name
---------------+-------------+------

See also