Why I cannot merge the two files, with left_join, in R? - r

Question

I am trying to link two files with left join, in R. I do not get the output I need.
Here is an example of two files:
here is file_1:
And when I do a left_join in R, I do not get what I want. Here is the code:
minap_piv_na_stemi_nstemi <- left_join(file_1, file_2)
As you can see in the last line, Rochdale Infirmary should be populated with the provider_name and trust_code. This is not happening? Can someone help ?

Answer 1

Try this. Use left_join to join by hospital_name. Use e.g. coalesce to fill in the missing information for trust_code and provider_name. Get rid of the .x and .y columns:
library(dplyr)
left_join(file_1, file_2, by = "hospital_name") %>%
mutate(trust_code = coalesce(trust_code.x, trust_code.y),
provider_name = coalesce(provider_name.x, provider_name.y)) %>%
select(-ends_with(".x"), -ends_with(".y"))
#> # A tibble: 182 x 3
#> hospital_name trust_code provider_name
#> <chr> <chr> <chr>
#> 1 Addenbrooke's Hospital RGT Cambridge University Hospitals NHS Founda…
#> 2 Royal Albert Edward In… RRF Wrightington, Wigan and Leigh NHS Foundat…
#> 3 Airedale General Hospi… RCF Airedale NHS Trust
#> 4 Wycombe Hospital RXQ Buckinghamshire Healthcare NHS Trust
#> 5 Barnsley Hospital RFF Barnsley Hospital NHS Foundation Trust
#> 6 Basildon Hospital RDD Basildon and Thurrock University Hospital…
#> 7 Royal United Hospital … RD1 Royal United Hospital Bath NHS Trust
#> 8 Bedford Hospital RC1 Bedford Hospital NHS Trust
#> 9 Broomfield Hospital RQ8 Mid Essex Hospital Services NHS Trust
#> 10 Rochdale Infirmary RW6 Pennine Acute Hospitals NHS Trust
#> # … with 172 more rows