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- Added a paragraph on implicit conversion in impala_datatypes.xml Change-Id: I2568450993323236535a8f1d022dee7d09ecf62b Reviewed-on: http://gerrit.cloudera.org:8080/14661 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com>
102 lines
4.0 KiB
XML
102 lines
4.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with 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,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="values">
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<title>VALUES Statement</title>
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<titlealts audience="PDF"><navtitle>VALUES</navtitle></titlealts>
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<prolog>
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<metadata>
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<data name="Category" value="Impala"/>
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<data name="Category" value="SQL"/>
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<data name="Category" value="Developers"/>
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<data name="Category" value="Data Analysts"/>
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</metadata>
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</prolog>
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<conbody>
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<p> In addition to being part of the <codeph>INSERT</codeph> statement, the
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<codeph>VALUES</codeph> clause can be used as stand-alone statement or
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with the <codeph>SELECT</codeph> statement to construct a data set without
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creating a table. For example, the following statement returns a data set
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of 2 rows and 3 columns.
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<codeblock>
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VALUES ('r1_c1', 'r1_c2', 'r1_c3')
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, ('r2_c1', 'r2_c2', 'r2_c3');</codeblock></p>
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<p><b>Syntax:</b></p>
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<codeblock>VALUES (<varname>row</varname>)[, (<varname>row</varname>), ...];
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SELECT <varname>select_list</varname> FROM (VALUES (<varname>row</varname>)[, (<varname>row</varname>), ...]) AS <varname>alias</varname>;
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<varname>row</varname> ::= <varname>column</varname> [[AS <varname>alias</varname>], <varname>column</varname> [AS <varname>alias</varname>], ...]</codeblock>
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<ul>
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<li>The <codeph>VALUES</codeph> keyword is followed by a comma separated
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list of one or more <varname>row</varname>s.</li>
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<li><varname>row</varname> is a comma-separated list of one or more
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<varname>column</varname>s.</li>
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<li>Each <varname>row</varname> must have the same number of
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<varname>column</varname>s.</li>
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<li><varname>column</varname> can be a constant, a variable, or an
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expression.</li>
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<li>The corresponding <varname>column</varname>s must have compatible data
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types in all <varname>row</varname>s. See the third query in the
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Examples section below.</li>
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<li>By default, the first row is used to name columns. But using the
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<codeph>AS</codeph> keyword, you can optionally give the column an
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<varname>alias</varname>. </li>
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<li>If used in the <codeph>SELECT</codeph> statement, the
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<codeph>AS</codeph> keyword with an <varname>alias</varname> is
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required.</li>
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<li>
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<varname>select_list</varname> is the columns to be selected for the
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result set.</li>
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</ul>
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<p><b>Examples:</b></p>
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<p>
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<codeblock>> SELECT * FROM (VALUES(4,5,6),(7,8,9)) AS t;
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+---+---+---+
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| 4 | 5 | 6 |
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+---+---+---+
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| 4 | 5 | 6 |
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| 7 | 8 | 9 |
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+---+---+---+
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> SELECT * FROM (VALUES(1 AS c1, true AS c2, 'abc' AS c3),(100,false,'xyz')) AS t;
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+-----+-------+-----+
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| c1 | c2 | c3 |
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+-----+-------+-----+
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| 1 | true | abc |
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| 100 | false | xyz |
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+-----+-------+-----+
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> VALUES (CAST('2019-01-01' AS TIMESTAMP)), ('2019-02-02');
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+---------------------------------+
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| cast('2019-01-01' as timestamp) |
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+---------------------------------+
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| 2019-01-01 00:00:00 |
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| 2019-02-02 00:00:00 |
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+---------------------------------+</codeblock>
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</p>
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<p><b>Related information:</b></p>
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<p>
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<xref href="impala_select.xml#select"/></p>
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</conbody>
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</concept>
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