492d5d174a
### What changes were proposed in this pull request? docs/sql-ref-syntax-qry-select-usedb.md -> docs/sql-ref-syntax-ddl-usedb.md docs/sql-ref-syntax-aux-refresh-table.md -> docs/sql-ref-syntax-aux-cache-refresh-table.md ### Why are the changes needed? usedb belongs to DDL. Its location should be consistent with other DDL commands file locations similar reason for refresh table ### Does this PR introduce _any_ user-facing change? before change, when clicking USE DATABASE, the side bar menu shows select commands <img width="1200" alt="Screen Shot 2020-07-04 at 9 05 35 AM" src="https://user-images.githubusercontent.com/13592258/86516696-b45f8a80-bdd7-11ea-8dba-3a5cca22aad3.png"> after change, when clicking USE DATABASE, the side bar menu shows DDL commands <img width="1120" alt="Screen Shot 2020-07-04 at 9 06 06 AM" src="https://user-images.githubusercontent.com/13592258/86516703-bf1a1f80-bdd7-11ea-8a90-ae7eaaafd44c.png"> before change, when clicking refresh table, the side bar menu shows Auxiliary statements <img width="1200" alt="Screen Shot 2020-07-04 at 9 30 40 AM" src="https://user-images.githubusercontent.com/13592258/86516877-3d2af600-bdd9-11ea-9568-0a6f156f57da.png"> after change, when clicking refresh table, the side bar menu shows Cache statements <img width="1199" alt="Screen Shot 2020-07-04 at 9 35 21 AM" src="https://user-images.githubusercontent.com/13592258/86516937-b4f92080-bdd9-11ea-8ad1-5f5a7f58d76b.png"> ### How was this patch tested? Manually build and check Closes #28995 from huaxingao/docs_fix. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Huaxin Gao <huaxing@us.ibm.com>
58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
---
|
|
layout: global
|
|
title: USE Database
|
|
displayTitle: USE Database
|
|
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
|
|
|
|
`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
|
|
|
|
```sql
|
|
USE database_name
|
|
```
|
|
|
|
### Parameter
|
|
|
|
* **database_name**
|
|
|
|
Name of the database will be used. If the database does not exist, an exception will be thrown.
|
|
|
|
### Examples
|
|
|
|
```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)
|
|
```
|
|
|
|
### Related Statements
|
|
|
|
* [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
|
|
* [DROP DATABASE](sql-ref-syntax-ddl-drop-database.html)
|
|
* [CREATE TABLE ](sql-ref-syntax-ddl-create-table.html)
|