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### What changes were proposed in this pull request? Document DROP DATABASE statement in SQL Reference ### Why are the changes needed? Currently from spark there is no complete sql guide is present, so it is better to document all the sql commands, this jira is sub part of this task. ### Does this PR introduce any user-facing change? Yes, Before there was no documentation about drop database syntax After Fix   ### How was this patch tested? tested with jenkyll build Closes #25554 from sandeep-katta/dropDbDoc. Authored-by: sandeep katta <sandeep.katta2007@gmail.com> Signed-off-by: Xiao Li <gatorsmile@gmail.com>
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| layout | title | displayTitle | license |
|---|---|---|---|
| global | DROP DATABASE | DROP DATABASE | 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 a database and delete the directory associated with the database from the file system. An exception will be thrown if the database does not exist in the system.
Syntax
{% highlight sql %} DROP (DATABASE|SCHEMA) [IF EXISTS] dbname [RESTRICT|CASCADE]; {% endhighlight %}
Parameters
DATABASE|SCHEMA- `DATABASE` and `SCHEMA` mean the same thing, either of them can be used.
IF EXISTS- If specified, no exception is thrown when the database does not exist.
RESTRICT- If specified, will restrict dropping a non-empty database and is enabled by default.
CASCADE- If specified, will drop all the associated tables and functions.
Example
{% highlight sql %}
-- Create inventory_db Database
CREATE DATABASE inventory_db COMMENT 'This database is used to maintain Inventory';
-- Drop the database and it's tables DROP DATABASE inventory_db CASCADE; +---------+ | Result | +---------+ +---------+
-- Drop the database using IF EXISTS DROP DATABASE IF EXISTS inventory_db CASCADE; +---------+ | Result | +---------+ +---------+
{% endhighlight %}