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@saieedkhalil Trial and errror. The easiest thing is to open the attribute table (CT Ave Monopoly Card) & click on a header from the joined layer to move the nulls to the top. Then, you have to try to figure out why it's null. Usually, it's due to a mismatch of GEOIDs/names. But sometimes...
@saieedkhalil ...it's because there are precincts or geographies in the original shapefile that have been merged or otherwise no longer exist. Then, you have to carefully look at the missing geos & try to figure out what happened.
@saieedkhalil QGIS is finicky about duplicative column names, sometimes. Thus, sometimes, you HAVE to add a prefix to the joined dataset or QGIS will choke and add nulls. It's also finicky about empty cells in your data at times.
