What is happening with XMLTABLE syntax?
Hello! What is - this with XMLTABLE syntax? For exampleof tgc_xml tt2, xmltable ('/ LINES/LINES ' in passing tt2.xml_field) tgc;
It is, first of all, that I declare the table in front of the call function, and then, after a comma, call a function with this table. How can I write these functions? If I can't do it in PL/SQL, how did Oracle did?
[Oracle documentation | http://docs.oracle.com/cd/E11882_01/appdev.112/e23094/xdb_xquery.htm#CBAHBFGE]
Documentation Oracle says:
Whenever a PASSAGE made clause refers to a column in an XMLType table in a query, this table should appear before the XMLTable expression in the query list. This is because the XMLTable expression depends on the table XMLType - a join (correlation) left side is necessary, to ensure a one-to-many (relationship 1: n) between consulted XMLType table line and generated lines of her by XMLTable.
Hello
It is, first of all, that I declare the table in front of the call function, and then, after a comma, call a function with this table. How can I write these functions? If I can't do it in PL/SQL, how did Oracle did?
What is so confusing to this topic? This is a built-in function based on the SQL/XML as XMLElement, XMLAgg etc standards.
Conceptually, we can see XMLTable as a function table in pipeline, with a clean syntax.
Something that, for example, is this not very different, and it is we have in (PL /) SQL:
SELECT x.*
FROM my_table t
, TABLE(
my_pipefunction(t.col1, t.col2)
) x
;
Tags: Database
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