What is the output of a CASE expression in a matrix search?

The output of a CASE expression in a matrix search is indeed a 0 or 1 based on the value's presence. This functionality is particularly useful when you need to evaluate whether a certain condition is met within the dataset being queried. The CASE expression evaluates a series of conditions and returns a value when the first condition is met. If none of the conditions are true, it typically defaults to returning a 0, indicating the absence of the evaluated value.

This allows users to easily determine the presence or absence of specific data points within the matrix search results. It provides a binary output (0 or 1), which simplifies logic checks and can be used in further computations or filtered searches.

The other options do not accurately represent what a CASE expression does. The total number of records in the database or a list of all available records would not relate to the specific evaluations of individual values, and counting all different field entries refers more to aggregate functions rather than the condition-driven nature of a CASE expression.