initExtension: Add useful extension functions

In real-didi/RSQLiteFixed: 'SQLite' Interface for R

Description

These extension functions are written by Liam Healy and made available through the SQLite website (http://www.sqlite.org/contrib).

Usage

initExtension(db)

Arguments

db	A SQLiteConnection object to load these extensions into.

Available extension functions

Math functions

acos, acosh, asin, asinh, atan, atan2, atanh, atn2, ceil, cos, cosh, cot, coth, degrees, difference, exp, floor, log, log10, pi, power, radians, sign, sin, sinh, sqrt, square, tan, tanh

String functions

charindex, leftstr, ltrim, padc, padl, padr, proper, replace, replicate, reverse, rightstr, rtrim, strfilter, trim

Aggregate functions

stdev, variance, mode, median, lower_quartile, upper_quartile

Examples

library(DBI)
db <- RSQLite::datasetsDb()
RSQLite::initExtension(db)

dbGetQuery(db, "SELECT stdev(mpg) FROM mtcars")
sd(mtcars$mpg)
dbDisconnect(db)

real-didi/RSQLiteFixed documentation built on May 21, 2019, 1:45 p.m.