# Table schema reference It has been noted that in smaller environments a full set of data may not be available. This may cause issues with the automation runbooks and the Power BI report due to required columns not being present in the Log Analytics workspace tables. Recent updates to the runbooks and the report have improved the handling of potentially missing columns to avoid them throwing errors. However, it is not possible to handle every potentially missing column. Therefore I have published a reference document containing the schema for each table used in this solution. This can be used to check your own tables and add any columns that may be missing. {% hint style="info" %} Note that not every column is required or will be populated in every environment. {% endhint %} You can find the table schema reference here: To add any missing columns, in your Log Analytics workspace, go to **Tables**. Open the context menu for the table and click **Edit schema**. Add the missing column with the correct data type and save your changes. --- # 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.smsagent.blog/microsoft-endpoint-manager-reporting/windows-update-for-business-custom-reporting/table-schema-reference.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.