Updating a table using a scalar subselect. Your Answer.
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How to use FOR UPDATE clause
See Also: However, application processes that are running with uncommitted read can access locked pages and rows. For each row that is updated, the value of the column in the expression is the value of the column in the row before the row is updated. Only the current record as defined in the opened cursor will be updated, with the SET clause specifying the new values for the indicated columns. For example, the following syntax is valid: Updating Views When a view is updated, the changes are reflected in the underlying database table. Modifying a row of a view also modifies the underlying base table of the view. The column names must not be qualified, and the same column must not be specified more than once. It must not include a column function. A view column derived from the same column as another column of the view can be updated, but both columns cannot be updated in the same UPDATE statement. NULL Specifies the null value as the new value of the column. Thus, if the application program is changed and then precompiled, that statement number might change. Oracle performs a correlated subquery when a nested subquery references a column from a table referred to a parent statement any number of levels above the subquery. Using the QUERYNO clause to assign unique numbers to the SQL statements in a program is helpful for simplifying the use of optimization hints for access path selection, if hints are used. Correlated references to these columns are allowed only in a searched UPDATE and only in the search condition of the subselect. If a view, the view must be updatable. Please refer to "Scalar Subquery Expressions " for more information.
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Using the QUERYNO clause to assign unique numbers to the SQL statements in a program is helpful for simplifying the use of optimization hints for access path selection, if hints are used. These updated rows can be optionally selected with a search condition.