R: Reads a CSV file into DuckDB

duckdb_read_csv {duckdb} | R Documentation

## Reads a CSV file into DuckDB

### Description

Directly reads a CSV file into DuckDB, tries to detect and create the correct schema for it. This usually is much faster than reading the data into R and writing it to DuckDB.

### Usage

    duckdb_read_csv(
      conn,
      name,
      files,
      header = TRUE,
      na.strings = "",
      nrow.check = 500,
      delim = ",",
      quote = "\"",
      col.names = NULL,
      lower.case.names = FALSE,
      sep = delim,
      transaction = TRUE,
      ...
    )

### Arguments

`conn` | A DuckDB connection, created by `dbConnect()`.
`name` | The name for the virtual table that is registered or unregistered
`files` | One or more CSV file names, should all have the same structure though
`header` | Whether or not the CSV files have a separate header in the first line
`na.strings` | Which strings in the CSV files should be considered to be NULL
`nrow.check` | How many rows should be read from the CSV file to figure out data types
`delim` | Which field separator should be used
`quote` | Which quote character is used for columns in the CSV file
`col.names` | Override the detected or generated column names
`lower.case.names` | Transform column names to lower case
`sep` | Alias for delim for compatibility
`transaction` | Should a transaction be used for the entire operation
`...` | Passed on to `read.csv()`

### Value

The number of rows in the resulted table, invisibly.

### Examples

    con <- dbConnect(duckdb())

    data <- data.frame(a = 1:3, b = letters[1:3])
    path <- tempfile(fileext = ".csv")

    write.csv(data, path, row.names = FALSE)

    duckdb_read_csv(con, "data", path)
    dbReadTable(con, "data")

    dbDisconnect(con)

[Package duckdb version 0.4.0 Index]