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| <title>Comments</title> |
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| <h1 class="title topictitle1" id="ariaid-title1">Comments</h1> |
| |
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| |
| <div class="body conbody"> |
| |
| <p class="p"> |
| |
| Impala supports the familiar styles of SQL comments: |
| </p> |
| |
| |
| <ul class="ul"> |
| <li class="li"> |
| All text from a <code class="ph codeph">--</code> sequence to the end of the line is considered a comment and ignored. |
| This type of comment can occur on a single line by itself, or after all or part of a statement. |
| </li> |
| |
| |
| <li class="li"> |
| All text from a <code class="ph codeph">/*</code> sequence to the next <code class="ph codeph">*/</code> sequence is considered a |
| comment and ignored. This type of comment can stretch over multiple lines. This type of comment can occur |
| on one or more lines by itself, in the middle of a statement, or before or after a statement. |
| </li> |
| |
| </ul> |
| |
| |
| <p class="p"> |
| For example: |
| </p> |
| |
| |
| <pre class="pre codeblock"><code>-- This line is a comment about a table. |
| create table ...; |
| |
| /* |
| This is a multi-line comment about a query. |
| */ |
| select ...; |
| |
| select * from t /* This is an embedded comment about a query. */ where ...; |
| |
| select * from t -- This is a trailing comment within a multi-line command. |
| where ...; |
| </code></pre> |
| </div> |
| |
| <div class="related-links"> |
| <div class="familylinks"> |
| <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/impala_langref.html">Impala SQL Language Reference</a></div> |
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