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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4000) Reference manual leaves != out of list of boolean operators
Date Mon, 05 Jan 2009 15:49:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660795#action_12660795
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Dag H. Wanvik commented on DERBY-4000:
--------------------------------------

Section 5.2 of SQL 2003 lists only '<>':

<not equals operator> ::= <>

so '!=' is non-standard SQL.

> Reference manual leaves != out of list of boolean operators
> -----------------------------------------------------------
>
>                 Key: DERBY-4000
>                 URL: https://issues.apache.org/jira/browse/DERBY-4000
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.5.0.0
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>
> Table 1, SQL Boolean Operators, at <URL:http://db.apache.org/derby/docs/dev/ref/rrefsqlj23075.html>
lists the comparison operators <, =, >, <=, >=, <>. Derby also accepts !=,
which I believe has the same meaning as <>. The != operator should be documented along
with the other operators. (I haven't checked whether != is standard SQL.)
> ij> select * from (values 1,2,3)v(x) where x != 2;
> X          
> -----------
> 1          
> 3          
> 2 rows selected
> ij> select * from (values 1,2,3)v(x) where x <> 2;
> X          
> -----------
> 1          
> 3          
> 2 rows selected

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