sqldf uses the SQLite database by default for backend processing. The iif
function is specific to the Jet database engine syntax (which underlies MS
Access). You could read up on SQLite syntax, or you could avoid using
nonstandard SQL syntax, retrieve the data into a data frame, and use R code to
do your logical merging into one column.
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Sent from my phone. Please excuse my brevity.
Carlos Rivera limnoriv...@gmail.com wrote:
Dear all,
I have problems with iif function using sqldf library.
I counted abundance (Num) of different SPECIES in two moments (esf)
saving
the information in two Tables (esf50, esf100):
esf50
SAMPLE SPECIES Num esf
1289diso1 44 50
1289diso2 5 50
1289diso3 1 50
diso1 44 50
diso2 5 50
diso3 1 50
esf100
SAMPLE SPECIES Num esf
1289diso1 82 100
1289diso2 13 100
1289diso3 2 100
1289diso4 3 100
diso1 82 100
diso2 13 100
diso3 2 100
diso4 3 100
I would like subtract column Num between the two moments considering
only
the changes, therefore I use the conditional if:
var100-sqldf(select esf100.SAMPLE, esf100.SPECIES, esf100.Num,
esf100.esf,
iif esf100.Num - esf50.Num =0, esf100.Num-esf50.Num,
esf100.Num as PIPAS
from esf100 left join esf50 on esf100.SAMPLE =
esf50.SAMPLE
and esf100.SPECIES = esf50.SPECIES)
I think the structure is right because the SQL query run ok in Access.
Is
the if syntax the problems?
Thank in advanced.
Best wishes,
Carlos Rivera
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