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lhs <- data.table::data.table(x = rep(c("b", "a", "c"), each = 3),
y = c(1, 3, 6),
v = 1:9)
rhs <- data.table::data.table(x = c("c", "b"),
v = 8:7,
foo = c(4, 2))
# https://www.r-bloggers.com/understanding-data-table-rolling-joins/
website <- data.table::rbindlist(list(
data.table::data.table(
name = rep("Indecisive Isabel", 5),
session_start_time = as.POSIXct(c("2016-01-01 11:01",
"2016-01-02 8:59",
"2016-01-05 18:18",
"2016-01-07 19:03",
"2016-01-08 19:01"))
),
data.table::data.table(
name = "Spendy Sally",
session_start_time = as.POSIXct("2016-01-03 10:00")
),
data.table::data.table(
name = rep("Frequent Francis", 6),
session_start_time = as.POSIXct(c("2016-01-02 13:09",
"2016-01-03 19:22",
"2016-01-08 8:44",
"2016-01-08 20:22",
"2016-01-10 17:36",
"2016-01-15 16:56"))
),
data.table::data.table(
name = rep("Error-prone Erica", 2),
session_start_time = as.POSIXct(c("2016-01-04 19:12",
"2016-01-04 21:05"))
),
data.table::data.table(
name = rep("Visitor Vivian", 2),
session_start_time = as.POSIXct(c("2016-01-01 9:10",
"2016-01-09 2:15"))
)
))
paypal <- data.table::rbindlist(list(
data.table::data.table(
name = "Indecisive Isabel",
purchase_time = as.POSIXct("2016-01-08 19:10")
),
data.table::data.table(
name = rep("Spendy Sally", 2),
purchase_time = as.POSIXct(c("2016-01-03 10:06",
"2016-01-03 10:15"))
),
data.table::data.table(
name = rep("Frequent Francis", 3),
purchase_time = as.POSIXct(c("2016-01-03 19:28",
"2016-01-08 20:33",
"2016-01-10 17:46"))
),
data.table::data.table(
name = "Error-prone Erica",
purchase_time = as.POSIXct("2016-01-03 08:02")
),
data.table::data.table(
name = "Mom",
purchase_time = as.POSIXct("2015-12-02 17:58")
)
))
data.table::setkey(website, name, session_start_time)
data.table::setkey(paypal, name, purchase_time)
website[, session_id := .GRP, by = .(name, session_start_time)]
paypal[, payment_id := .GRP, by = .(name, purchase_time)]
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