Skip to content

DB2 backend

Source: R/backend-db2.R
backend-db2.Rd

This backend supports IBM DB2 databases, typically accessed via ODBC. Use dialect_db2() with lazy_frame() to see simulated SQL without connecting to a live database.

Key differences for this backend are:

  • Uses FETCH FIRST n ROWS ONLY instead of LIMIT n

  • Uses double quotes for identifier quoting

  • paste() uses ||

  • DB2-specific data type names for casts (e.g. VARCHAR(255), DOUBLE)

  • Date component extraction via YEAR(), MONTH(), ..., DAYOFYEAR(), DAYOFWEEK(), QUARTER(), WEEK()

  • str_flatten() uses LISTAGG

  • Statistical summaries sd(), var(), cor(), cov()

  • runif() translates to RAND()

  • Regular expression functions (DB2 11.1+)

See vignette("translation-function") and vignette("translation-verb") for details of overall translation technology.

Usage

dialect_db2()

Examples

library(dplyr, warn.conflicts = FALSE)

lf <- lazy_frame(a = TRUE, b = 1, c = 2, d = "z", con = dialect_db2())
lf |> head()
#> <SQL>
#> SELECT *
#> FROM "df"
#> FETCH FIRST 6 ROWS ONLY
lf |> transmute(x = paste0(d, " times"))
#> <SQL>
#> SELECT "d" || ' times' AS "x"
#> FROM "df"
lf |> summarise(x = sd(b, na.rm = TRUE))
#> <SQL>
#> SELECT STDDEV_SAMP("b") AS "x"
#> FROM "df"