rquery (version 0.2.0)

project_se: project data by grouping, and adding aggregate columns.

Description

project data by grouping, and adding aggregate columns.

Usage

project_se(source, groupby, assignments, env = parent.frame())

Arguments

source

source to select from.

groupby

grouping columns.

assignments

new column assignment expressions.

env

environment to look for values in.

Value

project node.

Examples

# NOT RUN {
my_db <- DBI::dbConnect(RSQLite::SQLite(), ":memory:")
d <- dbi_copy_to(my_db, 'd',
                data.frame(AUC = 0.6, R2 = 0.2))
eqn <- project_se(d, "AUC", "v" := "max(R2)")
cat(format(eqn))
sql <- to_sql(eqn, my_db)
cat(sql)
DBI::dbGetQuery(my_db, sql)
DBI::dbDisconnect(my_db)

# }