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http://opensource.atlassian.com/projects/hibernate/browse/HHH-465?page=co...
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Steve Ebersole commented on HHH-465:
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In the interest of completeness, it is actually the SQL-2003 spec which introduces NULLS
FIRST | NULLS LAST.
Also, it does not define the "sort key" as simply as [COLUMN NAME]. In SQL-92
it was the case that a sort-key could only be (a) column name or (b) integer literal
(indicating the select-clause position). For SQL-2003 (and SQL-99), the full definition
of sort key is:
<sort key> ::= <value expression>
essentially anything that resolves to a value (see
http://savage.net.au/SQL/sql-2003-2.bnf.html#sort%20key for details)
The difficulty here is if we are going to support SQL-2003 then we need to support its
full breadth. Which implies an audit to see what databases fully comply with the various
SQL-2003 defined compatibility levels.
order by nulls first / last
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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&postday...
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