Backend: PostgreSQL
See vignette("translate-function") and vignette("translate-verb") for
details of overall translation technology. Key differences for this backend
are:
Many stringr functions
lubridate date-time extraction functions
More standard statistical summaries
Use simulate_postgres() with lazy_frame() to see simulated SQL without
converting to live access database.
simulate_postgres()
library(dplyr, warn.conflicts = FALSE) lf <- lazy_frame(a = TRUE, b = 1, c = 2, d = "z", con = simulate_postgres()) lf %>% summarise(x = sd(b, na.rm = TRUE)) lf %>% summarise(y = cor(b, c), y = cov(b, c))
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