# Table Compare - [Quickstart: open a couple of Excel spreadsheets](https://beyondcompare.gitbook.io/project/table-compare/quickstart-open-a-couple-of-excel-spreadsheets.md) - [Example: finding missing items in a pair of spreadsheets](https://beyondcompare.gitbook.io/project/table-compare/example-finding-missing-items-in-a-pair-of-spreadsheets.md) - [Keys](https://beyondcompare.gitbook.io/project/table-compare/keys.md): Key columns should have values that are (somewhat) unique to a given row, such as an ID number. Beyond Compare will give them precedence when trying to align your two tables. - [Mismatched Columns](https://beyondcompare.gitbook.io/project/table-compare/the-columns-on-my-two-tables-dont-match.md) - [Longer example, opening .csv files](https://beyondcompare.gitbook.io/project/table-compare/columns-file-formats-keys.md) - [How to remove columns from a spreadsheet](https://beyondcompare.gitbook.io/project/table-compare/how-to-remove-columns-from-a-spreadsheet.md) - [Aligned vs Unaligned](https://beyondcompare.gitbook.io/project/table-compare/aligned-vs-unaligned.md) - [Example: List of City Trees](https://beyondcompare.gitbook.io/project/table-compare/how-to-look-at-only-one-column.md): In this example we will open a very large table of public trees in Wisconsin and sort it. --- # 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://beyondcompare.gitbook.io/project/table-compare.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.