afe70b3b53
### What changes were proposed in this pull request? Document CREATE TABLE statement in SQL Reference Guide. ### Why are the changes needed? Adding documentation for SQL reference. ### Does this PR introduce any user-facing change? yes Before: There was no documentation for this. ### How was this patch tested? Used jekyll build and serve to verify. Closes #26759 from PavithraRamachandran/create_doc. Authored-by: Pavithra Ramachandran <pavi.rams@gmail.com> Signed-off-by: Sean Owen <srowen@gmail.com>
98 lines
3.1 KiB
Markdown
98 lines
3.1 KiB
Markdown
---
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layout: global
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title: CREATE TABLE LIKE
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displayTitle: CREATE TABLE LIKE
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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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The `CREATE TABLE` statement defines a new table using the definition/metadata of an existing table or view.
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### Syntax
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{% highlight sql %}
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CREATE TABLE [IF NOT EXISTS] table_identifier LIKE source_table_identifier
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USING data_source
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[ ROW FORMAT row_format ]
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[ STORED AS file_format ]
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[ TBLPROPERTIES ( key1=val1, key2=val2, ... ) ]
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[ LOCATION path ]
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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 a table name, which may be optionally qualified with a database name.<br><br>
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<b>Syntax:</b> [ TBLPROPERTIES ( key1=val1, key2=val2, ... ) ]
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<code>
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[ database_name. ] table_name
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</code>
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</dd>
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</dl>
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<dl>
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<dt><code><em>USING data_source</em></code></dt>
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<dd>Data Source is the input format used to create the table. Data source can be CSV, TXT, ORC, JDBC, PARQUET, etc.</dd>
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</dl>
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<dl>
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<dt><code><em>ROW FORMAT</em></code></dt>
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<dd>SERDE is used to specify a custom SerDe or the DELIMITED clause in order to use the native SerDe.</dd>
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</dl>
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<dl>
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<dt><code><em>STORED AS</em></code></dt>
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<dd>File format for table storage, could be TEXTFILE, ORC, PARQUET,etc.</dd>
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</dl>
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<dl>
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<dt><code><em>TBLPROPERTIES</em></code></dt>
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<dd>Table properties that have to be set are specified, such as `created.by.user`, `owner`, etc.
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</dd>
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</dl>
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<dl>
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<dt><code><em>LOCATION</em></code></dt>
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<dd>Path to the directory where table data is stored,Path to the directory where table data is stored, which could be a path on distributed storage like HDFS, etc. Location to create an external table.</dd>
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</dl>
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### Examples
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{% highlight sql %}
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--Create table using an exsisting table
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CREATE TABLE Student_Dupli like Student;
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--Create table like using a data source
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CREATE TABLE Student_Dupli like Student USING CSV;
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--Table is created as external table at the location specified
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CREATE TABLE Student_Dupli like Student location '/root1/home';
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--Create table like using a rowformat
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CREATE TABLE Student_Dupli like Student
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ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
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STORED AS TEXTFILE
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TBLPROPERTIES ('owner'='xxxx');
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{% endhighlight %}
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### Related Statements
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* [CREATE TABLE USING DATASOURCE](sql-ref-syntax-ddl-create-table-datasource.html)
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* [CREATE TABLE USING HIVE FORMAT](sql-ref-syntax-ddl-create-table-hiveformat.html)
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