Hi Matt, You are able to do this by using some simple logic in your label expression. Here is how to do it:
Left$(Str$(PID), Int(PID <> 0) * Len(Str$(PID))) + Left$(Str$(POT_PID), Int(POT_PID <> 0) * Len(Str$(POT_PID))) The trick here is to use the left$() function to extract a number of characters from the column. The number of characters is either 0 or them all. It is 0 if the expressions (PID <> 0) or (POT_PID <> 0) evaluate to true which they will do if they are not zero. The Int() function is just used to convert the logical value to a number, either 0 (false) or 1 true. Here after we multiply this value with the length of the value in the column. Note that the Str$() function is used to convert the number to a string to be able to use the Left$() and Len() function on these. HTH, Peter Horsbøll Møller GIS Developer Geographical Information & IT COWI A/S Odensevej 95 DK-5260 Odense S. Denmark Tel +45 6311 4900 Direct +45 6311 4908 Mob +45 5156 1045 Fax +45 6311 4949 E-mail [EMAIL PROTECTED] http://www.cowi.dk/gis -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Friday, January 14, 2005 12:45 AM To: mapinfo-l@lists.directionsmag.com Subject: MI-L Label query Hello MapInfo listers, I want to label polygons according to one of two fields (PID and POT_PID). In our data, a polygon has a real value for either one of these two fields, and a zero value for the other. I was wondering if it'd be possible to write a query that would label polygons according to the real value from either of these fields. Thanks in advance, Matt Davis, Project Officer, Crown Land Assessment and Classification Project, Department of Primary Industries, Water and Environment Level 5, 134 Macquarie Street, Hobart Telephone: (03) 6233 5112 Fax: (03) 6233 6655 E-mail: [EMAIL PROTECTED] Mailing address: GPO Box 44, Hobart, TAS, 7000 For further information on the Crown Land Assessment and Classification Project, visit our webpage at: http://www.dpiwe.tas.gov.au/clac CONFIDENTIALITY NOTICE AND DISCLAIMER The information in this transmission may be confidential and/or protected by legal professional privilege, and is intended only for the person or persons to whom it is addressed. If you are not such a person, you are warned that any disclosure, copying or dissemination of the information is unauthorised. If you have received the transmission in error, please immediately contact this Office by telephone, fax or email, to inform us of the error and to enable arrangements to be made for the destruction of the transmission, or its return at our cost. No liability is accepted for any unauthorised use of the information contained in this transmission. If the transmission contains advice, the advice is based on instructions in relation to, and is provided to the addressee in connection with, the matter mentioned above. Responsibility is not accepted for reliance upon it by any other person or for any other purpose. --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 14839
