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sql-ref-syntax-qry-select-offset.md

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OFFSET Clause
OFFSET Clause
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 OFFSET clause is used to specify the number of rows to skip before beginning to return rows returned by the SELECT statement. In general, this clause is used in conjunction with ORDER BY to ensure that the results are deterministic.

Syntax

OFFSET integer_expression

Parameters

  • integer_expression

    Specifies a foldable expression that returns an integer.

Examples

CREATE TABLE person (name STRING, age INT);
INSERT INTO person VALUES
    ('Zen Hui', 25),
    ('Anil B', 18),
    ('Shone S', 16),
    ('Mike A', 25),
    ('John A', 18),
    ('Jack N', 16);

-- Skip the first two rows.
SELECT name, age FROM person ORDER BY name OFFSET 2;
+-------+---+
|   name|age|
+-------+---+
| John A| 18|
| Mike A| 25|
|Shone S| 16|
|Zen Hui| 25|
+-------+---+

-- Skip the first two rows and returns the next three rows.
SELECT name, age FROM person ORDER BY name LIMIT 3 OFFSET 2;
+-------+---+
|   name|age|
+-------+---+
| John A| 18|
| Mike A| 25|
|Shone S| 16|
+-------+---+

-- A function expression as an input to OFFSET.
SELECT name, age FROM person ORDER BY name OFFSET length('SPARK');
+-------+---+
|   name|age|
+-------+---+
|Zen Hui| 25|
+-------+---+

-- A non-foldable expression as an input to OFFSET is not allowed.
SELECT name, age FROM person ORDER BY name OFFSET length(name);
org.apache.spark.sql.AnalysisException: The offset expression must evaluate to a constant value ...

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