you place your order in xquery-distinct values
I was surprised to see the return of the following different results, is this a bug in the XML Query rewrite, or is the order of not only guaranteed the distinct values?
Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production
With partitioning, OLAP, Data Mining and Real Application Testing options
SQL > SELECT XMLQUERY)
2 ' (string code points
3 distinct-values ((99,98,97)))'
4 ELECTION CONTENT) result
5 FROM dual;
RESULT
--------------------------------------------------------------------------------
ABC
SQL > SELECT / * + NO_XML_QUERY_REWRITE * /.
() 2 XMLQUERY
3 ' (string code points
distinct-values ((99,98,97))) 4'
5 ELECTION CONTENT) result
6 FROM dual;
RESULT
--------------------------------------------------------------------------------
CBA
SQL >
Hello
The specs say the order is "dependent application": fn: distinct values
Summary so is (I guess), strict language point of view, should not rest on any apparent order in the resulting sequence.
The results collected by the two queries probably be different for the same reason: different implementation.
First one with XQuery Rewrite active is solved using the SQL operators and functions, something along these lines:
SELECT 'CODEPOINT2STR_FUNC' ('SEQUENCE')
DE)
SELECT 'AGGREGATE_FUNC' (VALUE (T) SEPARATE) "SEQUENCES".
TABLE ("SEQUENCE_FUNC"(99, 98, 97)) T
) ;
While the second is evaluated by the XVM and apparently maintains the original order.
Tags: Database
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You mean, more like this...
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