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| <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
| <concept id="values"> |
| |
| <title>VALUES Statement</title> |
| <titlealts audience="PDF"><navtitle>VALUES</navtitle></titlealts> |
| <prolog> |
| <metadata> |
| <data name="Category" value="Impala"/> |
| <data name="Category" value="SQL"/> |
| <data name="Category" value="Developers"/> |
| <data name="Category" value="Data Analysts"/> |
| </metadata> |
| </prolog> |
| |
| <conbody> |
| <p> In addition to being part of the <codeph>INSERT</codeph> statement, the |
| <codeph>VALUES</codeph> clause can be used as stand-alone statement or |
| with the <codeph>SELECT</codeph> statement to construct a data set without |
| creating a table. For example, the following statement returns a data set |
| of 2 rows and 3 columns. |
| <codeblock> |
| VALUES ('r1_c1', 'r1_c2', 'r1_c3') |
| , ('r2_c1', 'r2_c2', 'r2_c3');</codeblock></p> |
| <p><b>Syntax:</b></p> |
| <codeblock>VALUES (<varname>row</varname>)[, (<varname>row</varname>), ...]; |
| |
| SELECT <varname>select_list</varname> FROM (VALUES (<varname>row</varname>)[, (<varname>row</varname>), ...]) AS <varname>alias</varname>; |
| |
| <varname>row</varname> ::= <varname>column</varname> [[AS <varname>alias</varname>], <varname>column</varname> [AS <varname>alias</varname>], ...]</codeblock> |
| <ul> |
| <li>The <codeph>VALUES</codeph> keyword is followed by a comma separated |
| list of one or more <varname>row</varname>s.</li> |
| <li><varname>row</varname> is a comma-separated list of one or more |
| <varname>column</varname>s.</li> |
| <li>Each <varname>row</varname> must have the same number of |
| <varname>column</varname>s.</li> |
| <li><varname>column</varname> can be a constant, a variable, or an |
| expression.</li> |
| <li>The corresponding <varname>column</varname>s must have compatible data |
| types in all <varname>row</varname>s. See the third query in the |
| Examples section below.</li> |
| <li>By default, the first row is used to name columns. But using the |
| <codeph>AS</codeph> keyword, you can optionally give the column an |
| <varname>alias</varname>. </li> |
| <li>If used in the <codeph>SELECT</codeph> statement, the |
| <codeph>AS</codeph> keyword with an <varname>alias</varname> is |
| required.</li> |
| <li> |
| <varname>select_list</varname> is the columns to be selected for the |
| result set.</li> |
| </ul> |
| <p><b>Examples:</b></p> |
| <p> |
| <codeblock>> SELECT * FROM (VALUES(4,5,6),(7,8,9)) AS t; |
| +---+---+---+ |
| | 4 | 5 | 6 | |
| +---+---+---+ |
| | 4 | 5 | 6 | |
| | 7 | 8 | 9 | |
| +---+---+---+ |
| |
| > SELECT * FROM (VALUES(1 AS c1, true AS c2, 'abc' AS c3),(100,false,'xyz')) AS t; |
| +-----+-------+-----+ |
| | c1 | c2 | c3 | |
| +-----+-------+-----+ |
| | 1 | true | abc | |
| | 100 | false | xyz | |
| +-----+-------+-----+ |
| |
| > VALUES (CAST('2019-01-01' AS TIMESTAMP)), ('2019-02-02'); |
| +---------------------------------+ |
| | cast('2019-01-01' as timestamp) | |
| +---------------------------------+ |
| | 2019-01-01 00:00:00 | |
| | 2019-02-02 00:00:00 | |
| +---------------------------------+</codeblock> |
| </p> |
| <p><b>Related information:</b></p> |
| <p> |
| <xref href="impala_select.xml#select"/></p> |
| </conbody> |
| </concept> |