babefdee1c
### What changes were proposed in this pull request? Standardize sql reference ### Why are the changes needed? To have consistent docs ### Does this PR introduce any user-facing change? Yes ### How was this patch tested? Tested using jykyll build --serve Closes #26721 from huaxingao/spark-30085. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Sean Owen <sean.owen@databricks.com>
88 lines
2.6 KiB
Markdown
88 lines
2.6 KiB
Markdown
---
|
|
layout: global
|
|
title: DROP TABLE
|
|
displayTitle: DROP TABLE
|
|
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
|
|
|
|
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
|
|
|
|
`DROP TABLE` deletes the table and removes the directory associated with the table from the file system
|
|
if the table is not `EXTERNAL` table. If the table is not present it throws an exception.
|
|
|
|
In case of an external table, only the associated metadata information is removed from the metastore database.
|
|
|
|
### Syntax
|
|
{% highlight sql %}
|
|
DROP TABLE [ IF EXISTS ] table_identifier
|
|
{% endhighlight %}
|
|
|
|
### Parameter
|
|
<dl>
|
|
<dt><code><em>IF EXISTS</em></code></dt>
|
|
<dd>
|
|
If specified, no exception is thrown when the table does not exists.
|
|
</dd>
|
|
<dt><code><em>table_identifier</em></code></dt>
|
|
<dd>
|
|
Specifies the table name to be dropped. The table name may be optionally qualified with a database name.<br><br>
|
|
<b>Syntax:</b>
|
|
<code>
|
|
[ database_name. ] table_name
|
|
</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
### Example
|
|
{% highlight sql %}
|
|
-- Assumes a table named `employeetable` exists.
|
|
DROP TABLE employeetable;
|
|
+---------+--+
|
|
| Result |
|
|
+---------+--+
|
|
+---------+--+
|
|
|
|
-- Assumes a table named `employeetable` exists in the `userdb` database
|
|
DROP TABLE userdb.employeetable;
|
|
+---------+--+
|
|
| Result |
|
|
+---------+--+
|
|
+---------+--+
|
|
|
|
-- Assumes a table named `employeetable` does not exists.
|
|
-- Throws exception
|
|
DROP TABLE employeetable;
|
|
Error: org.apache.spark.sql.AnalysisException: Table or view not found: employeetable;
|
|
(state=,code=0)
|
|
|
|
-- Assumes a table named `employeetable` does not exists,Try with IF EXISTS
|
|
-- this time it will not throw exception
|
|
DROP TABLE IF EXISTS employeetable;
|
|
+---------+--+
|
|
| Result |
|
|
+---------+--+
|
|
+---------+--+
|
|
|
|
{% endhighlight %}
|
|
|
|
### Related Statements
|
|
- [CREATE TABLE](sql-ref-syntax-ddl-create-table.html)
|
|
- [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
|
|
- [DROP DATABASE](sql-ref-syntax-ddl-drop-database.html)
|
|
|
|
|