在R中合并多列read.csv

Question

IS there a way to combine multiple columns into a single column while reading data from csv files.

Example

My data in file is in below format ID,DOB,FirstName,LastName,DOJ

In read.csv/read.table is it possible to convert this into a four column, where First and Last names are combined to get a new column called Name.

Answer 1

I would do it with the sqldf package eg:

require(sqldf)

# Example Data
df <- data.frame(
  ID  = 1:5,
  DOB = 1:5,
  FirstName = c("a", "b", "c", "d", "e"),
  LastName = c("A", "B", "C", "D", "E"),
  DOJ = 1:5)

# Write to disc to load it afterwards
write.csv(df, "example.csv", quote = FALSE, row.names = FALSE)

# Using SQL to combine ...
sql <- "Select ID, DOB, FirstName || ' ' || LastName as Name from file"
out <- read.csv.sql("example.csv", sql = sql)
out
# ID DOB Name
# 1  1   1  a A
# 2  2   2  b B
# 3  3   3  c C
# 4  4   4  d D
# 5  5   5  e E