Unique occurence of values
710419Sep 1 2009 — edited Sep 1 2009Hi and thank you for reading,
I have currently a table with the three columns continent, country, city, but the occurrence of a city is not unique in the table, so it looks like this:
NA USA NYC
SA Brasil San Paolo
EUR France Paris
EUR Germany Berlin
NA USA NYC
...
I would like to construct a table, which reduces the occurrence of each city to only once. How can I do that?
Thanks a lot for your help!
Evgeny