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sql-ref-syntax-ddl-drop-variable.md

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DROP TEMPORARY VARIABLE
DROP TEMPORARY VARIABLE
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 DROP TEMPORARY VARIABLE statement drops a temporary variable. An exception will be thrown if the variable does not exist.

Syntax

DROP TEMPORARY { VAR | VARIABLE } [ IF EXISTS ] variable_name

Parameters

  • variable_name

    Specifies the name of an existing variable. The function name may be optionally qualified with a system.session or session.

    Syntax: [ system. [ session.] ] variable_name

  • IF EXISTS

    If specified, no exception is thrown when the variable does not exist.

Examples

-- Create a temporary variable var1
DECLARE VARIABLE var1 INT;

-- Drop temporary variable
DROP TEMPORARY VARIABLE var1;

-- Try to drop temporary variable which is not present
DROP TEMPORARY VARIABLE var1;
[VARIABLE_NOT_FOUND] The variable `system`.`session`.`var1` cannot be found. Verify the spelling and correctness of the schema and catalog.
If you did not qualify the name with a schema and catalog, verify the current_schema() output, or qualify the name with the correct schema and catalog.
To tolerate the error on drop use DROP VARIABLE IF EXISTS. SQLSTATE: 42883
  
-- Drop temporary variable if it exists
DROP TEMPORARY VARIABLE IF EXISTS var1;

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