Skip to content

Latest commit

 

History

History
88 lines (66 loc) · 2.51 KB

sql-ref-syntax-ddl-truncate-table.md

File metadata and controls

88 lines (66 loc) · 2.51 KB
Raw
layout title displayTitle license
global
TRUNCATE TABLE
TRUNCATE TABLE
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Description

The TRUNCATE TABLE statement removes all the rows from a table or partition(s). The table must not be a view or an external/temporary table. In order to truncate multiple partitions at once, the user can specify the partitions in partition_spec. If no partition_spec is specified it will remove all partitions in the table.

Syntax

TRUNCATE TABLE table_identifier [ partition_spec ]

Parameters

  • table_identifier

    Specifies a table name, which may be optionally qualified with a database name.

    Syntax: [ database_name. ] table_name

  • partition_spec

    An optional parameter that specifies a comma separated list of key and value pairs for partitions.

    Syntax: PARTITION ( partition_col_name = partition_col_val [ , ... ] )

Examples

-- Create table Student with partition
CREATE TABLE Student (name STRING, rollno INT) PARTITIONED BY (age INT);

SELECT * FROM Student;
+----+------+---+
|name|rollno|age|
+----+------+---+
| ABC|     1| 10|
| DEF|     2| 10|
| XYZ|     3| 12|
+----+------+---+

-- Removes all rows from the table in the partition specified
TRUNCATE TABLE Student partition(age=10);

-- After truncate execution, records belonging to partition age=10 are removed
SELECT * FROM Student;
+----+------+---+
|name|rollno|age|
+----+------+---+
| XYZ|     3| 12|
+----+------+---+

-- Removes all rows from the table from all partitions
TRUNCATE TABLE Student;

SELECT * FROM Student;
+----+------+---+
|name|rollno|age|
+----+------+---+
+----+------+---+

Related Statements