In Web Intelligence, you are editing a previously saved query and accidentally delete a logical operator (for example, AND) between two filters. What is the simplest way to recover the deleted logical operator before running the query?

Introduction / Context:
When designing filters in the Web Intelligence Query panel, logical operators such as AND and OR control how multiple filter conditions work together. Accidentally deleting one of these operators can change the logic of the query and affect its results. Fortunately, the Query panel includes an Undo function that allows you to reverse recent actions. Understanding how to use Undo effectively is helpful both in daily work and on certification exams.

Given Data / Assumptions:

• You are working in the Query panel on an existing query with several filters.
• You accidentally remove a logical operator between filters, changing the filter logic.
• You notice the mistake before running the query.
• The Query panel provides basic editing tools, including an Undo button.

Concept / Approach:
The Undo function is designed to reverse the most recent change or series of changes that you have made in the Query panel. This includes modifications to filters and logical operators. By using Undo immediately after deleting an operator, you can restore the original filter structure without rebuilding it manually. This is usually the quickest and safest way to recover from minor editing mistakes during query design.

Step-by-Step Solution:
Step 1: Recognise that the deletion of the logical operator was the most recent change in the Query panel. Step 2: Identify the Undo button in the Query panel toolbar, which is intended to reverse the last action. Step 3: Click Undo once and check whether the deleted operator has been restored between the filters. Step 4: If additional undesired changes were made, you can click Undo multiple times until the filter logic returns to the desired state. Step 5: Once satisfied, save the query definition and run it with the correct logical operators in place.

Verification / Alternative check:
In practical use, users frequently make small errors such as deleting filters, changing operators, or modifying prompts incorrectly. The Undo feature provides a quick way to revert these operations. If you delete an AND operator between two filters and immediately click Undo, you will see the operator reappear and the filters restored to their previous logical structure. Only if you have moved on and made many further changes might Undo become less convenient. This behaviour confirms that Undo is the simplest recovery method in this scenario.

Why Other Options Are Wrong:
Option b is incorrect because there is no need to rebuild all filters from scratch; this approach wastes time and increases the risk of introducing new errors. Option c is misleading because closing the Query panel and running the query will not automatically restore the operator; you would still need to re edit the query. Option d mentions a Recover Operator command in the Tools menu, which does not exist in standard Web Intelligence; this is a distractor. Option e suggests exporting and re importing the query definition, which is unnecessary and much more complicated than simply using Undo.

Common Pitfalls:
One pitfall is to forget about the Undo function and immediately attempt to recreate complex filter logic manually, which can lead to mistakes. Another is to make many additional edits after an error and then rely on Undo, complicating the sequence of changes. For exams and good practice, remember that the quickest way to fix a simple accidental deletion of a logical operator in the Query panel is to use the Undo button.

Final Answer:
The simplest way to recover a deleted logical operator before running the query is to click the Undo button in the Query panel, which reverses the last action and restores the operator.