[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-465) order by nulls first / last

[Steve Ebersole (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34450#action_34450 ] 

Steve Ebersole commented on HHH-465:
------------------------------------

It was suggested that a better work around for MySQL (which still does not have NULLS FIRST/LAST support btw) would be to do somethign like this:

* for NULLS FIRST : order by case when property is null then 0 else 1 end, property
* for NULLS LAST  : order by case when property is null then 1 else 0 end, property

(the original suggestion was to use the MySQL specific function IF instead of the CASE...)

> order by nulls first / last
> ---------------------------
>
>                 Key: HHH-465
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-465
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.0.3
>            Reporter: Anthony Patricio
>            Priority: Minor
>         Attachments: CustomNullsFirstInterceptor.java
>
>
> support of nulls first / last in order clause
> "NULLS LAST" is part of the SQL 99 standard. 
> The syntax is as follows: 
> ORDER BY [COLUMN NAME] [ASC | DESC] [NULLS FIRST | NULLS LAST] 
> In different DBs, the sorting of nulls relative to other values is handled differently. 
> PostgreSQL - Nulls are considered HIGHER than non-nulls. 
> DB2 - Higher 
> MSSQL - Lower 
> MySQL - Lower 
> Oracle - Higher 
> The following DBs have supported this functionality: 
> DB2 V7 
> Oracle 9i 
> PostgreSQL, MySQL, SQLServer do not appear to support this from what I can gather.
> see http://forum.hibernate.org/viewtopic.php?t=942176&start=0&postdays=0&postorder=asc&highlight=

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