https://www.wix.com/velo/reference/wix-data/query
https://www.wix.com/velo/reference/wix-dataset/dataset/getitems
https://www.wix.com/velo/reference/wix-dataset/dataset/getcurrentitem
Here you will find a lot of information → all about DATABASES and FILTERING.
You have just to read the given POSTs and EXAMPLES in this interactive-filter-tool.
https://www.media-junkie.com/pflegeservice