Update Query Generated By Fetch Query Sql Version

Jun 22, 2012 - There are two methods for running queries in SQL Developer. Run statement brings your query results to a grid with a single fetch. The process on the server that was used to execute the query is still hanging around too. The second query doesn't know about the table created using the WITH clause.

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When TOP is used with INSERT, UPDATE, MERGE, or DELETE, the referenced rows are not arranged in any order and the ORDER BY clause can not be directly specified in these statements. If you need to use TOP to insert, delete, or modify rows in a meaningful chronological order, you must use TOP together with an ORDER BY clause that is specified in a subselect statement. TOP cannot be used in an UPDATE and DELETE statements on partitioned views. TOP cannot be combined with OFFSET and FETCH in the same query expression (in the same query scope). For more information, see.

XQuery is a very general and expressive language, and SQL/XML functions XMLQuery, XMLTable, XMLExists, and XMLCast combine that power of expression and computation with the strengths of SQL. You typically use XQuery with Oracle XML DB in the following ways.

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The examples here are organized to reflect these different uses. • Query XML data in Oracle XML DB Repository. • Query a relational table or view as if it were XML data. To do this, you use XQuery function fn:collection, passing as argument a URI that uses the URI-scheme name oradb together with the database location of the data. • Query XMLType data, possibly decomposing the resulting XML into relational data using function XMLTable. Creates Oracle XML DB Repository resources that are used in some of the other examples in this chapter. Example 5-1 Creating Resources for Examples DECLARE res BOOLEAN; empsxmlstring VARCHAR2(300):= ' '; empsxmlnsstring VARCHAR2(300):= ' '; deptsxmlstring VARCHAR2(300):= ' '; BEGIN res:= DBMS_XDB_REPOS.createResource('/public/emps.xml', empsxmlstring); res:= DBMS_XDB_REPOS.createResource('/public/empsns.xml', empsxmlnsstring); res:= DBMS_XDB_REPOS.createResource('/public/depts.xml', deptsxmlstring); END; /.

It is important to keep in mind that XQuery is a general sequence-manipulation language. Its expressions and their results are not necessarily XML data.

An XQuery sequence can contain items of any XQuery type, which includes numbers, strings, Boolean values, dates, and various types of XML node ( document-node(), element(), attribute(), text(), namespace(), and so on). Provides a sampling. It applies SQL/XML function XMLQuery to an XQuery sequence that contains items of several different kinds: • an integer literal: 1 • a arithmetic expression: 2 + 3 • a string literal: 'a' • a sequence of integers: 100 to 102 • a constructed XML element node: 33 also shows construction of a sequence using the comma operator (,) and parentheses ( (, )) for grouping. The sequence expression 100 to 102 evaluates to the sequence (100, 101, 102), so the argument to XMLQuery here is a sequence that contains a nested sequence.

The sequence argument is automatically flattened, as is always the case for XQuery sequences. The argument is, in effect, (1, 5, 'a', 100, 101, 102, 33). • for iterates over the emp elements in /public/emps.xml, binding variable $e to the value of each such element, in turn. That is, it iterates over a general list of employees, binding $e to each employee. • let binds variable $d to a sequence consisting of all of the values of dname attributes of those dept elements in /public/emps.xml whose deptno attributes have the same value as the deptno attribute of element $e (this is a join operation). That is, it binds $d to the names of all of the departments that have the same department number as the department of employee $e. (It so happens that the dname value is unique for each deptno value in depts.xml.) Note that, unlike for, let never iterates over values; $d is bound only once in this example.

• Together, for and let produce a stream of tuples ( $e, $d), where $e represents an employee and $d represents the names of all of the departments to which that employee belongs —in this case, the unique name of the employee's unique department. • where filters this tuple stream, keeping only tuples with employees whose salary is greater than 100,000. • order by sorts the filtered tuple stream by employee number, empno (in ascending order, by default). • return constructs emp elements, one for each tuple. Attributes ename and dept of these elements are constructed using attribute ename from the input and $d, respectively. Note that the element and attribute names emp and ename in the output have no necessary connection with the same names in the input document emps.xml.