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Backend: MS Access

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

See vignette("translation-function") and vignette("translation-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.

Usage

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 `df`.*
#> 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 `df`.*, `z` & ' times' AS `a`
#> FROM `df`