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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 | USE Database | USE 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
USE statement is used to set the current database. After the current database is set,
the unqualified database artifacts such as tables, functions and views that are
referenced by SQLs are resolved from the current database.
The default database name is 'default'.
Syntax
{% highlight sql %} USE database_name {% endhighlight %}
Parameter
database_name- Name of the database will be used. If the database does not exist, an exception will be thrown.
Examples
{% highlight sql %} -- Use the 'userdb' which exists. USE userdb;
-- Use the 'userdb1' which doesn't exist USE userdb1; Error: org.apache.spark.sql.catalyst.analysis.NoSuchDatabaseException: Database 'userdb1' not found;(state=,code=0) {% endhighlight %}