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https://issues.apache.org/jira/browse/DERBY-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557726#action_12557726
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Daniel John Debrunner commented on DERBY-3297:
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The SIGN function actually returns an INTEGER, -1, 0 or 1.

> Document SIGN, SQRT, RAND, RANDOM, COSH, COT, SINH and TANH functions.
> ----------------------------------------------------------------------
>
>                 Key: DERBY-3297
>                 URL: https://issues.apache.org/jira/browse/DERBY-3297
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>            Reporter: Daniel John Debrunner
>            Assignee: Thomas Nielsen
>            Priority: Minor
>         Attachments: d3297-doc-1.diff, d3297-doc-1.stat, d3297-doc-2.diff, 
> rreffunccosh.html, rreffunccot.html, rreffuncrand.html, rreffuncrandom.html, 
> rreffuncsign.html, rreffuncsinh.html, rreffunctanh.html, toc.html
>
>
> These functions were added by DERBY-1808

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