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Posted by DA Morgan on 06/15/07 21:01
Serge Rielau wrote:
> Hi folks,
>
> My fellow team mates had some extra time on their hands so we decided to
> spice up DB2 with a grab-bag of compatibility features.
> We wouldn't mind help validating the semantics match....
> So for those of you blessed or cursed with a competitive DBMS here is a
> list of what we've added:
>
> 1. ** DUAL
> Always works without prefixing a schema
> 2. ** ROWNUM
> 3. ** (+) outer join syntax
> 4. LEAST/GREATEST/NVL/DECODE
> 5. TO_DATE/TO_CHAR improvement
> DB2 supports most common patterns except those requiring language
> awareness
> 6. ** CONNECT BY
> This is a function drop, performance drop will follow
> 7. A slew of syntactic sugar like:
> Seq.NEXTVAL and seq.CURRVAL notation
> UNIQUE instead of DISTINCT
> MINUS instead of EXCEPT
> Unnamed nested subqueries (aka inline views)
> "SELECT * FROM (SELECT * FROM T)"
> CROSSJOIN
> 8. BITAND/BITOR/.....
>
> The features marked with ** require a registry setting:
> db2set DB2_COMPATIBILITY_VECTOR=3F
> should switch everything on.
>
> There are other features those porting apps will value:
> GLOBAL VARIABLES
> A new ARRAY data type
> A new RID() function can be used to map ROWID
>
> Docs: https://publib.boulder.ibm.com/infocenter/db2luw/v9r5/index.jsp
>
> Enjoy
> Serge
With little more work and you'll be compatible with Oracle. <g>
Well done.
--
Daniel A. Morgan
University of Washington
damorgan@x.washington.edu (replace x with u to respond)
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