Adding column matches manually
If you want to show data from multiple data tables in a single visualization, the data tables must have at least one column match available. If the data in the data tables is similar, column matching often happens automatically, but you can add manual matches using the installed client when needed.
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Tip: Another way to fix some issues with missing column
matches is to rename the columns to group by in the additional data tables, so
they use identical names (and data types) as in the main data table. Then, the
automatic column matching will kick in.