Dear experts, There seems to be some interest in this matter so here goes, thank you to all who have considered it. The conclusion, is there is no way of having MI graphically indicate two coincident regions are simultaneously selected. An inference, which I take on board, is that the table design is flawed if it contains coincident regions. I am thinking about alternative ways of creating the table. The problem which resulted in my creating a table with coincident regions is this the country is divided into a series of numbered licences, regions in my table. Over time licences are reissued with either the same number or new numbers to different operators. Over time the boundaries of the licences change. I have tabular data indicating which current licence numbers are fully or partially equivalent to which previous numbers, the equivalence can be to the same number or to different numbers, thus current number 3067 could have been previously held as 3067 as 1334 or as 574 (with the proviso that 574 intersected current 3067 but was not exactly coincident). In respect of each previous number I have data on operators etc. Using the equivalence data I did SQL to link each previous identity to the current area and then appended the results of all the SQLs to a single table. I wished to use my mappable table of current boundaries to determine the history of any area graphically selectable. I also wished to see which areas were held by any named company, unfortunately if a named company held an area an even number of times the selection of the area is not apparent graphically, other than this weakness the strategy seems to work. Any comments would be gratefully received Brendan brendan.o'[EMAIL PROTECTED] ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
