Hi
I have an file containing data about the availability of apartments in buildings at different periods of the year e.g. H1 2012, H2 2012, H1 2013 etc.. Each building has an unique id attached to it. Buildings are constantly being added and some buildings are removed when they don't have any available apartments or their data was not captured during that specific period (no reponse)
I would like to calculate the difference between the total number of available apartments between 2 periods (sold apartments) e.g. H1 2012 and H2 2012 but only for buildings that appear in those both time periods.
How can it be done? Thanks in advance
I have an file containing data about the availability of apartments in buildings at different periods of the year e.g. H1 2012, H2 2012, H1 2013 etc.. Each building has an unique id attached to it. Buildings are constantly being added and some buildings are removed when they don't have any available apartments or their data was not captured during that specific period (no reponse)
I would like to calculate the difference between the total number of available apartments between 2 periods (sold apartments) e.g. H1 2012 and H2 2012 but only for buildings that appear in those both time periods.
How can it be done? Thanks in advance