topic Field Calculate Overwriting Existing Data in ModelBuilder Questions https://community.esri.com/t5/modelbuilder-questions/field-calculate-overwriting-existing-data/m-p/809951#M1300 <HTML><HEAD></HEAD><BODY><P>I am trying to use model builder to field calculate a bunch of values and I'm having this problem with the data being overwritten.&nbsp; I've ran this type of model a million other times with no issue so I'm not sure what I'm doing wrong.&nbsp;&nbsp;</P><P></P><P>In the attached image of the model, I have two feature classes with address data.&nbsp; LocIDAssigned_2 is the master data set.&nbsp; I am trying to take data from NTP05 and field calculating it into the master dataset.&nbsp; I did a join on a mutual field "street address" because that is the common unique field that both datasets share.&nbsp; From there, I just field calc each field.&nbsp; This works and the data I want calculated shows up just fine.&nbsp; Where things go wrong, is when I try to do the same process with a new dataset.&nbsp; If I field calc using the same process for the next dataset, for example NTP06, all the data that was calculated for NTP05 is erased.&nbsp; It's like I can only field calc for one dataset, instead of building upon the previous dataset.&nbsp; I hope that makes sense.&nbsp;</P><P></P><P>I've been able to field calculate multiple datasets into one before with no issue so I'm not sure why data is disappearing?&nbsp; It's like it is being overwritten?</P></BODY></HTML> Wed, 03 Jul 2019 16:40:56 GMT KatyW 2019-07-03T16:40:56Z Field Calculate Overwriting Existing Data https://community.esri.com/t5/modelbuilder-questions/field-calculate-overwriting-existing-data/m-p/809951#M1300 <HTML><HEAD></HEAD><BODY><P>I am trying to use model builder to field calculate a bunch of values and I'm having this problem with the data being overwritten.&nbsp; I've ran this type of model a million other times with no issue so I'm not sure what I'm doing wrong.&nbsp;&nbsp;</P><P></P><P>In the attached image of the model, I have two feature classes with address data.&nbsp; LocIDAssigned_2 is the master data set.&nbsp; I am trying to take data from NTP05 and field calculating it into the master dataset.&nbsp; I did a join on a mutual field "street address" because that is the common unique field that both datasets share.&nbsp; From there, I just field calc each field.&nbsp; This works and the data I want calculated shows up just fine.&nbsp; Where things go wrong, is when I try to do the same process with a new dataset.&nbsp; If I field calc using the same process for the next dataset, for example NTP06, all the data that was calculated for NTP05 is erased.&nbsp; It's like I can only field calc for one dataset, instead of building upon the previous dataset.&nbsp; I hope that makes sense.&nbsp;</P><P></P><P>I've been able to field calculate multiple datasets into one before with no issue so I'm not sure why data is disappearing?&nbsp; It's like it is being overwritten?</P></BODY></HTML> Wed, 03 Jul 2019 16:40:56 GMT https://community.esri.com/t5/modelbuilder-questions/field-calculate-overwriting-existing-data/m-p/809951#M1300 KatyW 2019-07-03T16:40:56Z