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### What changes were proposed in this pull request? SQL Reference cleanup ### Why are the changes needed? To complete SQL Reference ### Does this PR introduce _any_ user-facing change? updated sql-ref-syntax-qry.html before <img width="1100" alt="Screen Shot 2020-04-29 at 11 08 25 PM" src="https://user-images.githubusercontent.com/13592258/80677799-70b27280-8a6e-11ea-8e3f-a768f29d0377.png"> after <img width="1100" alt="Screen Shot 2020-04-29 at 11 05 55 PM" src="https://user-images.githubusercontent.com/13592258/80677803-74de9000-8a6e-11ea-880c-aa05c53254a6.png"> ### How was this patch tested? Manually build and check Closes #28417 from huaxingao/cleanup. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
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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 | SCHEMADATABASEandSCHEMAmean 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.
Examples
{% 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;
-- Drop the database using IF EXISTS DROP DATABASE IF EXISTS inventory_db CASCADE; {% endhighlight %}