I have a workbook that contains several MySQL data sources. I replaced the data sources and edited the workbook several times. Now I am trying to change data sources from live to extract. When I click extract I get empty data source for some of them. So everything related to these data in the workbook disappear. These extracts are filtered and with incremental refresh. Any clues?
It seems that either your joins in your datasources are wrong.
Or you are just filtering in your extract which results in zero rows.