Backend: MS Access

Source: R/backend-access.R

See vignette("translate-function") and vignette("translate-verb") for details of overall translation technology. Key differences for this backend are:

  • SELECT uses TOP, not LIMIT

  • Non-standard types and mathematical functions

  • String concatenation uses &

  • No ANALYZE equivalent

  • TRUE and FALSE converted to 1 and 0

Use simulate_access() with lazy_frame() to see simulated SQL without converting to live access database.

simulate_access()

Examples

library(dplyr, warn.conflicts = FALSE)
lf <- lazy_frame(x = 1, y = 2, z = "a", con = simulate_access())

lf %>% head()

#> <SQL>
#> SELECT TOP 6 *
#> FROM `df`
lf %>% mutate(y = as.numeric(y), z = sqrt(x^2 + 10))

#> <SQL>
#> SELECT `x`, CDBL(`y`) AS `y`, SQR(`x` ^ 2.0 + 10.0) AS `z`
#> FROM `df`
lf %>% mutate(a = paste0(z, " times"))

#> <SQL>
#> SELECT `x`, `y`, `z`, `z` & ' times' AS `a`
#> FROM `df`