Data Science Desktop Survival Guide by Graham Williams
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Modify Columns

ds %>%
  select(date, location, pressure_9am)

## # A tibble: 176,747 x 3
##    date       location pressure_9am
##    <date>     <chr>           <dbl>
##  1 2008-12-01 Albury          1008.
##  2 2008-12-02 Albury          1011.
##  3 2008-12-03 Albury          1008.
....

ds %>%
  mutate(pressure_9am=round(pressure_9am, 0)) %>%
  select(date, location, pressure_9am)

## # A tibble: 176,747 x 3
##    date       location pressure_9am
##    <date>     <chr>           <dbl>
##  1 2008-12-01 Albury           1008
##  2 2008-12-02 Albury           1011
##  3 2008-12-03 Albury           1008
....

To convert all character columns to be numeric:

ds %>%
  mutate(across(where(is.character), as.numeric))