tables_used: Return vector of table names used.

In WinVector/rquery: Relational Query Generator for Data Manipulation at Scale

Return vector of table names used.

Description

Return vector of table names used.

Usage

tables_used(node, ...)

Arguments

node	rquery tree to examine.
...	(not used)

Value

names of tables used.

Examples

if (requireNamespace("DBI", quietly = TRUE) && requireNamespace("RSQLite", quietly = TRUE)) {
  my_db <- DBI::dbConnect(RSQLite::SQLite(), ":memory:")
  d1 <- rq_copy_to(my_db, 'd1',
                    data.frame(AUC = 0.6, R2 = 0.2))
  d2 <- rq_copy_to(my_db, 'd2',
                    data.frame(AUC = 0.6, D = 0.3))
  optree <- natural_join(d1, d2, by = "AUC")
  cat(format(optree))
  print(tables_used(optree))
  DBI::dbDisconnect(my_db)
}

WinVector/rquery documentation built on Aug. 24, 2023, 11:12 a.m.