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>
98 lines
2.8 KiB
Markdown
98 lines
2.8 KiB
Markdown
---
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layout: global
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title: SHOW COLUMNS
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displayTitle: SHOW COLUMNS
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license: |
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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---
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### Description
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Return the list of columns in a table. If the table does not exist, an exception is thrown.
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### Syntax
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{% highlight sql %}
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SHOW COLUMNS table_identifier [ database ]
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{% endhighlight %}
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### Parameters
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<dl>
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<dt><code><em>table_identifier</em></code></dt>
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<dd>
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Specifies the table name of an existing table. The table may be optionally qualified
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with a database name.<br><br>
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<b>Syntax:</b>
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<code>
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{ IN | FROM } [ database_name . ] table_name
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</code><br><br>
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<b>Note:</b>
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Keywords <code>IN</code> and <code>FROM</code> are interchangeable.
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</dd>
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<dt><code><em>database</em></code></dt>
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<dd>
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Specifies an optional database name. The table is resolved from this database when it
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is specified. Please note that when this parameter is specified then table
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name should not be qualified with a different database name. <br><br>
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<b>Syntax:</b>
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<code>
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{ IN | FROM } database_name
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</code><br><br>
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<b>Note:</b>
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Keywords <code>IN</code> and <code>FROM</code> are interchangeable.
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</dd>
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</dl>
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### Examples
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{% highlight sql %}
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-- Create `customer` table in `salesdb` database;
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USE salesdb;
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CREATE TABLE customer(cust_cd INT,
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name VARCHAR(100),
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cust_addr STRING);
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-- List the columns of `customer` table in current database.
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SHOW COLUMNS IN customer;
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+---------+
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|col_name |
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+---------+
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|cust_cd |
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|name |
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|cust_addr|
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+---------+
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-- List the columns of `customer` table in `salesdb` database.
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SHOW COLUMNS IN salesdb.customer;
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+---------+
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|col_name |
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+---------+
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|cust_cd |
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|name |
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|cust_addr|
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+---------+
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-- List the columns of `customer` table in `salesdb` database
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SHOW COLUMNS IN customer IN salesdb;
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+---------+
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|col_name |
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+---------+
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|cust_cd |
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|name |
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|cust_addr|
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+---------+
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{% endhighlight %}
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### Related Statements
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- [DESCRIBE TABLE](sql-ref-syntax-aux-describe-table.html)
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- [SHOW TABLE](sql-ref-syntax-aux-show-table.html)
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