layout: global title: ALTER VIEW displayTitle: ALTER VIEW license: | 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

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Description

The ALTER VIEW statement can alter metadata associated with the view. It can change the definition of the view, change the name of a view to a different name, set and unset the metadata of the view by setting TBLPROPERTIES.

RENAME View

Renames the existing view. If the new view name already exists in the source database, a TableAlreadyExistsException is thrown. This operation does not support moving the views across databases.

Syntax

{% highlight sql %} ALTER VIEW view_identifier RENAME TO view_identifier {% endhighlight %}

Parameters

SET View Properties

Set one or more properties of an existing view. The properties are the key value pairs. If the properties' keys exist, the values are replaced with the new values. If the properties' keys do not exist, the key value pairs are added into the properties.

Syntax

{% highlight sql %} ALTER VIEW view_identifier SET TBLPROPERTIES ( property_key = property_val [ , ... ] ) {% endhighlight %}

Parameters

UNSET View Properties

Drop one or more properties of an existing view. If the specified keys do not exist, an exception is thrown. Use IF EXISTS to avoid the exception.

Syntax

{% highlight sql %} ALTER VIEW view_identifier UNSET TBLPROPERTIES [ IF EXISTS ] ( property_key [ , ... ] ) {% endhighlight %}

Parameters

ALTER View AS SELECT

ALTER VIEW view_identifier AS SELECT statement changes the definition of a view, the SELECT statement must be valid, and the view_identifier must exist.

Syntax

{% highlight sql %} ALTER VIEW view_identifier AS select_statement {% endhighlight %}

Parameters

Examples

{% highlight sql %} -- Rename only changes the view name. -- The source and target databases of the view have to be the same. -- Use qualified or unqualified name for the source and target view
ALTER VIEW tempdb1.v1 RENAME TO tempdb1.v2;

-- Verify that the new view is created. DESCRIBE TABLE EXTENDED tempdb1.v2;

+----------------------------+----------+-------+ |col_name |data_type |comment| +----------------------------+----------+-------+ |c1 |int |null | |c2 |string |null | | | | | |# Detailed Table Information| | | |Database |tempdb1 | | |Table |v2 | | +----------------------------+----------+-------+

-- Before ALTER VIEW SET TBLPROPERTIES DESC TABLE EXTENDED tempdb1.v2;

+----------------------------+----------+-------+ |col_name |data_type |comment| +----------------------------+----------+-------+ |c1 |int |null | |c2 |string |null | | | | | |# Detailed Table Information| | | |Database |tempdb1 | | |Table |v2 | | |Table Properties |[....] | | +----------------------------+----------+-------+

-- Set properties in TBLPROPERTIES ALTER VIEW tempdb1.v2 SET TBLPROPERTIES (‘created.by.user’ = “John”, ‘created.date’ = ‘01-01-2001’ );

-- Use DESCRIBE TABLE EXTENDED tempdb1.v2 to verify DESC TABLE EXTENDED tempdb1.v2;

+----------------------------+-----------------------------------------------------+-------+ |col_name |data_type |comment| +----------------------------+-----------------------------------------------------+-------+ |c1 |int |null | |c2 |string |null | | | | | |# Detailed Table Information| | | |Database |tempdb1 | | |Table |v2 | | |Table Properties |[created.by.user=John, created.date=01-01-2001, ....]| | +----------------------------+-----------------------------------------------------+-------+

-- Remove the key created.by.user and created.date from TBLPROPERTIES ALTER VIEW tempdb1.v2 UNSET TBLPROPERTIES (‘created.by.user’, ‘created.date’);

--Use DESC TABLE EXTENDED tempdb1.v2 to verify the changes DESC TABLE EXTENDED tempdb1.v2;

+----------------------------+----------+-------+ |col_name |data_type |comment| +----------------------------+----------+-------+ |c1 |int |null | |c2 |string |null | | | | | |# Detailed Table Information| | | |Database |tempdb1 | | |Table |v2 | | |Table Properties |[....] | | +----------------------------+----------+-------+

-- Change the view definition ALTER VIEW tempdb1.v2 AS SELECT * FROM tempdb1.v1;

-- Use DESC TABLE EXTENDED to verify DESC TABLE EXTENDED tempdb1.v2;

+----------------------------+---------------------------+-------+ |col_name |data_type |comment| +----------------------------+---------------------------+-------+ |c1 |int |null | |c2 |string |null | | | | | |# Detailed Table Information| | | |Database |tempdb1 | | |Table |v2 | | |Type |VIEW | | |View Text |select * from tempdb1.v1 | | |View Original Text |select * from tempdb1.v1 | | +----------------------------+---------------------------+-------+ {% endhighlight %}

Related Statements

Note:

ALTER VIEW statement does not support SET SERDE or SET SERDEPROPERTIES properties