Pitney Bowes MapInfo Professional - Manual (Page 282)

Table to Update is already set to STATES and Column to Update is automatically set to Add new
temporary column.
7. In the Get Value From Table box, select CITY_125.
If that is the only other table open, MapInfo Professional automatically displays its title in the list box.
When you create a temporary column for a thematic map, the field must be a numeric field.
This is true for all thematic maps except individual values. Note:
Since in our example, we are looking for the percentage of the population living in urban areas in the
United States, we need to calculate the total of the CITY_125 population; that is, we must calculate
the total of the population of each city in a each state. We need to put that sum into the temporary
column.
8. In the Calculate box, choose Sum.
9. In the of box, choose Tot_pop.
To put the data from the CITY_125 table into the temporary column of the STATES table, there must
be a link between the two tables that MapInfo Professional can use to access the data. MapInfo
Professional can often make this link automatically. In this example, both our tables have a State
field.
10. Click Join.
The Specify Join dialog box opens.
MapInfo Professional 12.5 282
Updating Columns using Thematic Mapping