# Cardinality calculation In Pentaho Data Catalog cardinality is a measure of the uniqueness of values within a table column concerning the total number of rows in that table. It helps understand the data's uniqueness and can assist in data analysis and profiling within Data Catalog. **Note:** Cardinality calculation is particularly relevant for RDBMS data sources. Once you've processed the data source within Data Catalog, go to Data Canvas and select a column. You can see the Cardinality score in the Statistics panel under the Summary tab. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.pentaho.com/pdc-use/ldc-explore-your-data-cp/cardinality-calculation.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.