TRUNCATE Statements

TRUNCATE Statements #

Batch

TRUNCATE statements are used to delete all rows from a table without dropping the table itself.

Attention Currently, TRUNCATE statement is supported in batch mode, and it requires the target table connector implements the SupportsTruncate interface to support the row-level delete. An exception will be thrown if trying to TRUNCATE a table which has not implemented the related interface.

Run a TRUNCATE statement #

TRUNCATE statement can be executed with the executeSql() method of the TableEnvironment. The executeSql() method will throw an exception when there is any error for the operation.

The following examples show how to run a TRUNCATE statement in TableEnvironment.

TRUNCATE statements can be executed with the executeSql() method of the TableEnvironment. The executeSql() will throw an exception when there is any error for the operation.

The following examples show how to run a single TRUNCATE statement in TableEnvironment.

TRUNCATE statements can be executed with the execute_sql() method of the TableEnvironment. The execute_sql() will throw an exception when there is any error for the operation.

The following examples show how to run a single TRUNCATE statement in TableEnvironment.

TRUNCATE statement can be executed in SQL CLI.

The following examples show how to run a TRUNCATE statement in SQL CLI.

EnvironmentSettings settings = EnvironmentSettings.newInstance().inBatchMode().build();
TableEnvironment tEnv = TableEnvironment.create(settings);

// register a table named "Orders"
tEnv.executeSql("CREATE TABLE Orders (`user` STRING, product STRING, amount INT) WITH (...)");

// insert values
tEnv.executeSql("INSERT INTO Orders VALUES ('Lili', 'Apple', 1), ('Jessica', 'Banana', 2), ('Mr.White', 'Chicken', 3)").await();
tEnv.executeSql("SELECT * FROM Orders").print();
// +--------------------------------+--------------------------------+-------------+
// |                           user |                        product |      amount |
// +--------------------------------+--------------------------------+-------------+
// |                           Lili |                          Apple |           1 |
// |                        Jessica |                         Banana |           2 |
// |                       Mr.White |                        Chicken |           3 |
// +--------------------------------+--------------------------------+-------------+
// 3 rows in set
        
// truncate the table "Orders"
tEnv.executeSql("TRUNCATE TABLE Orders").await();
tEnv.executeSql("SELECT * FROM Orders").print();
// Empty set

val env = StreamExecutionEnvironment.getExecutionEnvironment()
val settings = EnvironmentSettings.newInstance().inBatchMode().build()
val tEnv = StreamTableEnvironment.create(env, settings)

// register a table named "Orders"
tEnv.executeSql("CREATE TABLE Orders (`user` STRING, product STRING, amount INT) WITH (...)")
// insert values
tEnv.executeSql("INSERT INTO Orders VALUES ('Lili', 'Apple', 1), ('Jessica', 'Banana', 2), ('Mr.White', 'Chicken', 3)").await()
tEnv.executeSql("SELECT * FROM Orders").print()
// +--------------------------------+--------------------------------+-------------+
// |                           user |                        product |      amount |
// +--------------------------------+--------------------------------+-------------+
// |                           Lili |                          Apple |           1 |
// |                        Jessica |                         Banana |           2 |
// |                       Mr.White |                        Chicken |           3 |
// +--------------------------------+--------------------------------+-------------+
// 3 rows in set
// truncate the table "Orders"
tEnv.executeSql("TRUNCATE TABLE Orders").await()
tEnv.executeSql("SELECT * FROM Orders").print()
// Empty set

env_settings = EnvironmentSettings.in_batch_mode()
table_env = TableEnvironment.create(env_settings)

# register a table named "Orders"
table_env.execute_sql("CREATE TABLE Orders (`user` STRING, product STRING, amount INT) WITH (...)")
# insert values
table_env.execute_sql("INSERT INTO Orders VALUES ('Lili', 'Apple', 1), ('Jessica', 'Banana', 2), ('Mr.White', 'Chicken', 3)").wait()
table_env.execute_sql("SELECT * FROM Orders").print()
# +--------------------------------+--------------------------------+-------------+
# |                           user |                        product |      amount |
# +--------------------------------+--------------------------------+-------------+
# |                           Lili |                          Apple |           1 |
# |                        Jessica |                         Banana |           2 |
# |                       Mr.White |                        Chicken |           3 |
# +--------------------------------+--------------------------------+-------------+
# 3 rows in set
# truncate the table "Orders"
table_env.execute_sql("TRUNCATE TABLE Orders").wait()
table_env.execute_sql("SELECT * FROM Orders").print()
# Empty set

Flink SQL> SET 'execution.runtime-mode' = 'batch';
[INFO] Session property has been set.

Flink SQL> CREATE TABLE Orders (`user` STRING, product STRING, amount INT) with (...);
[INFO] Execute statement succeeded.

Flink SQL> INSERT INTO Orders VALUES ('Lili', 'Apple', 1), ('Jessica', 'Banana', 1), ('Mr.White', 'Chicken', 3);
[INFO] Submitting SQL update statement to the cluster...
[INFO] SQL update statement has been successfully submitted to the cluster:
Job ID: bd2c46a7b2769d5c559abd73ecde82e9

Flink SQL> SELECT * FROM Orders;
    user                         product      amount
    Lili                           Apple           1
 Jessica                          Banana           2
Mr.White                         Chicken           3

Flink SQL> TRUNCATE TABLE Orders;
[INFO] Execute statement succeeded.

Flink SQL> SELECT * FROM Orders;
// Empty set

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Syntax # 

TRUNCATE TABLE [catalog_name.][db_name.]table_name