Syntax of xmltable function

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От Pavel Stehule
Тема Syntax of xmltable function
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Msg-id CAFj8pRDEy1P5SvDrCk8bqSjiP5SUF2OfPQ+diLxENw421rwv-Q@mail.gmail.com
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Ответы Re: Syntax of xmltable function  (Tom Lane <tgl@sss.pgh.pa.us>)
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Hi

I am working on xmltable function. This function is used for simple data extraction from XML documents. In this moment I am working on prototype's parser.

The SQL/XML syntax is:

XMLTABLE (
  xmlquery
  PASSING xmldocument
  [COLUMNS columns_list] )

columns_list := column_list ',' colname

colname := colname datatype [DEFAULT value] [PATH text]

The DEFAULT clause is before PATH clause.

I am able to implement the default clause with c_expr - It is enough for almost all usage.

What is question?

A Oracle db uses little bit different syntax - the DEFAULT and PATH clause are in different order. This is little bit better for Postgres too - now I can use a_expr in DEFAULT clause - what can be little bit better for other than text types.

What should be preferrable? ANSI SQL syntax or Oracle syntax? This is not often task - I didn't find any example with DEFAULT clause for Oracle.

DB2 and Sybase uses exact ANSI SQL syntax.

Regards

Pavel

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