When creating a legend, you can select to perform a join to add a temporary column from another table that you can use for your feature descriptions in a legend frame. You can use this column for your feature descriptions. Again, this column can be any column value, or one that you create. This column is saved automatically in the workspace.
Creating a legend using joined information is useful if you have a large table of many records that fall into a small number of categories. Instead of repeating the category descriptions over all the records, a code is assigned to each category and stored for each record instead of a description. A different table stores the code and its description. You can use the category description in the legend, not the code, once a join between two tables exists. You can do this by using the description column for legend labels. (It is also possible to create this kind of look-up table in a table's metadata.)
Join option is only available when there are at least two tables open in MapInfo Pro.
To create the legend using joined information:
For an example of creating a theme using a join, see Updating Columns using Thematic Mapping.
See Also: