[R] problems when merging two data sets

sasa kosanic @@@@@ko@@n|c @end|ng |rom gm@||@com
Tue Feb 5 18:56:37 CET 2019

Dear All,

I would like to merge two data sets however I am doing something wrong...
1 data set contains 2 columns of  'species occurrence'(1 column) in Germany
and  'species names' (2 column).
and the second one names of 'Red list species'(1 column) and 'species
status' (2 column).
so I would like to merge Red list species with species names from the first
table and to sign the  species status
I have tried with merge function but got this an error:" 'by' must specify
a uniquely valid column"
I also tried with the function left_join, however no success.

Also columns in two data sets are different in size. 1 table has 7189 rows
and 2 table just 426 rows as we do not have much Red list Species.

I would appreciate your help.

Kind regards,

Dr Sasha Kosanic
Ecology Lab (Biology Department)
Room M842
University of Konstanz
Universitätsstraße 10
D-78464 Konstanz
Phone: +49 7531 883321 & +49 (0)175 9172503


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