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Queries 97

Creating a Query

The New Query dialog is displayed.

Select Copy of and from the drop-down list select a module that you want to

copy.

Click OK.

The query definition is displayed.

Note To save this as a new query, you are only required to enter a name in the Name field. You

can modify the other settings at a later time.

Deriving a Query from Another Query

Deriving a query from another query allows you to create a variant version of an

existing query. You can derive from any query, including your own User query, a

System query, or a query created by another user. You can even derive a query from

another derived query. The query from which a derived query is made is called its base

query, and is permanently linked to it.

You cannot create a derived query and give it the same name as another query in your

module. If you enter a name that is already in use, an alert icon ( ) is displayed beside

the field and the Save button is disabled.

A derived query may extend its base query’s list of Required Parameters, and replace its

Filter Results Based on TopN, Aggregations, Order By and Where sections. If the

derived query adds Required Parameters, their numerical order comes after that of the

base query.

A simple example of where you might want to use derived queries is a base query that

selects a group of Events, and a derived query that aggregates those events into a

maximum severity.

In the editor, normally you are not allowed to edit or replace the Filter Results Based on

Top N, Aggregation, Order By or Where settings in a derived query if those settings are

already established in the base query. However, it is possible to get into a situation

where both the base query and the derived query contain settings for any of these

properties as follows:

• Start with a base query with the property, for example Aggregations, that is not

set.

• Derive a query from it, and set Aggregations on the derived query.

• Go back to the base query, and set Aggregations on it.

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Dell Vizioncore Betriebsanweisung Seite 97