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3be0f122a5
These are refugees from doc_prototype. They can be rendered with the DITA Open Toolkit version 2.3.3 by: /tmp/dita-ot-2.3.3/bin/dita \ -i impala.ditamap \ -f html5 \ -o $(mktemp -d) \ -filter impala_html.ditaval Change-Id: I8861e99adc446f659a04463ca78c79200669484f Reviewed-on: http://gerrit.cloudera.org:8080/5014 Reviewed-by: John Russell <jrussell@cloudera.com> Tested-by: John Russell <jrussell@cloudera.com>
54 lines
1.5 KiB
XML
54 lines
1.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="comments">
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<title>Comments</title>
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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>
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<indexterm audience="Cloudera">comments (SQL)</indexterm>
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Impala supports the familiar styles of SQL comments:
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</p>
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<ul>
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<li>
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All text from a <codeph>--</codeph> sequence to the end of the line is considered a comment and ignored.
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This type of comment can occur on a single line by itself, or after all or part of a statement.
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</li>
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<li>
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All text from a <codeph>/*</codeph> sequence to the next <codeph>*/</codeph> sequence is considered a
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comment and ignored. This type of comment can stretch over multiple lines. This type of comment can occur
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on one or more lines by itself, in the middle of a statement, or before or after a statement.
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</li>
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</ul>
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<p>
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For example:
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</p>
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<codeblock>-- This line is a comment about a table.
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create table ...;
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/*
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This is a multi-line comment about a query.
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*/
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select ...;
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select * from t /* This is an embedded comment about a query. */ where ...;
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select * from t -- This is a trailing comment within a multi-line command.
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where ...;
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</codeblock>
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</conbody>
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</concept>
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