Assign null to variable in oracle

Steven Feuerstein February 18, at AM. Jan March 6, at AM. Steven Feuerstein March 6, at AM. Popular posts from this blog. Get rid of mutating table trigger errors with the compound trigger. December 13, When something mutates, it is changing. Something that is changing is hard to analyze and to quantify. In particular, this error occurs when a row-level trigger attempts to read or write the table from which the trigger was fired. Fortunately, the same restriction does not apply in statement-level triggers.

In this post, I demonstrate the kind of scenario that will result in an ORA errors. I then show the "traditional" solution, using a collection defined in a package. Then I demonstrate how to use the compound trigger, added in Oracle Database 11g Release1, to solve the problem much more simply.

All the code shown in this example may be found in this LiveSQL script. Read more. October 31, That's the default and only setting for cursor FOR loop optimizations.

It offers a sweet spot of improved performance over row-by-row and not-too-much PGA memory consumption. For example, you might want to map a value from the Chain in the Sources pane, such as an input variable or the result of an action, to a Page variable or to the input of another action in the Target pane. When you select the variable in the Target pane, the expression editor in the dialog box displays the expression for the source. Previous Next JavaScript must be enabled to correctly display this content.

To add an Assign Variables action to an action chain:. User-defined types, just like collections, are atomically null, until you initialize the object by calling the constructor for its object type.

That is, the object itself is null, not just its attributes. Comparing a null object with any other object always yields NULL. Also, if you assign an atomically null object to another object, the other object becomes atomically null and must be reinitialized.