True ETL Tools
If you need more than just to copy data from ServiceNow to ClickHouse, you may use Skyvia's powerful ETL functionality for ServiceNow and ClickHouse integration. Skyvia's Import tool will correctly extract ServiceNow data, transform it, and load to ClickHouse when ClickHouse tables have different structure than ServiceNow objects. Besides, if you ever need to load data back from ClickHouse to ServiceNow, Skyvia Import allows loading data in any direction, supporting Reverse ETL scenario.
For more complex cases, you can use Data Flow and Control Flow tools. They are designer-based solutions for creating complex data pipelines, involving not only ServiceNow and ClickHouse connectors, but any number of connectors in one integration. With these tools you can automate data workflows, involving custom logic, complex multistage transformations, combine data from different sources, load them into multiple destinations at once and many more.