I use sqldf to join 2 dataframes from 2 distinct databases : a and b come
from old sqldf's.
sqldf("select a.*, b.*, case a.QTY when null then b.QTY else a.QTY end as
NEW_QTY"
from a inner join b on a.OBJECT=b.OBJECT")
R doesn't understand "when null". I tried with "when NA", "when '' ", "when
' ' " but it doesn't work.
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