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### 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>
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| layout | title | displayTitle | license |
|---|---|---|---|
| global | CREATE HIVEFORMAT TABLE | CREATE HIVEFORMAT TABLE | 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
The CREATE TABLE statement defines a new table using Hive format.
Syntax
{% highlight sql %} CREATE [ EXTERNAL ] TABLE [ IF NOT EXISTS ] table_identifier [ ( col_name1[:] col_type1 [ COMMENT col_comment1 ], ... ) ] [ COMMENT table_comment ] [ PARTITIONED BY ( col_name2[:] col_type2 [ COMMENT col_comment2 ], ... ) | ( col_name1, col_name2, ... ) ] [ ROW FORMAT row_format ] [ STORED AS file_format ] [ LOCATION path ] [ TBLPROPERTIES ( key1=val1, key2=val2, ... ) ] [ AS select_statement ]
{% endhighlight %}
Parameters
table_identifier-
Specifies a table name, which may be optionally qualified with a database name.
Syntax:[ database_name. ] table_name
EXTERNAL- Table is defined using the path provided as LOCATION, does not use default location for this table.
PARTITIONED BY- Partitions are created on the table, based on the columns specified.
ROW FORMAT- SERDE is used to specify a custom SerDe or the DELIMITED clause in order to use the native SerDe.
STORED AS- File format for table storage, could be TEXTFILE, ORC, PARQUET,etc.
LOCATION- 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.
COMMENT- Table comments are added.
TBLPROPERTIES- Table properties that have to be set are specified, such as `created.by.user`, `owner`, etc.
AS select_statement- The table is populated using the data from the select statement.
Examples
{% highlight sql %}
--Using Comment and loading data from another table into the created table CREATE TABLE StudentInfo COMMENT 'Table is created using existing data' AS SELECT * FROM Student;
--Partitioned table CREATE TABLE Student (Id INT,name STRING) PARTITIONED BY (age INT) TBLPROPERTIES ('owner'='xxxx');
CREATE TABLE Student (Id INT,name STRING,age INT) PARTITIONED BY (name,age);
--Using Row Format and file format CREATE TABLE Student (Id INT,name STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS TEXTFILE;
{% endhighlight %}