r Replace only some table values with values from alternate table

Question

This is not a \"vlookup-and-fill-down\" question.

My source data is excellent at delivering all the data I need, just not in in a usable form. Recent changes in volume

Answer 1

We could use eat from my package safejoin, and "patch" the matches from the rhs into the lhs when columns conflict.

We rename Backordered to onPO on the way so the two columns conflict as desired.

# devtools::install_github("moodymudskipper/safejoin")
library(safejoin)
library(dplyr)

eat(inv, svc, onPO = Backordered, .conflict = "patch")
#          Item onHand demand onPO
# 1    10100200    600   3300 2700
# 2    10100201     NA     NA   20
# 3    10100202     39     40    1
# 4    10100203      0     40   40
# 5    10100204     NA     NA  100
# 6  10100205-A     NA     NA   18
# 7    10100206     40     70   30
# 8    10100207      0    126  126
# 9    10100208      0     10   10
# 10   10100209      0     10   10
# 11   10100210      0    250  250