teal.data (version 0.5.0)

join_key: Create a relationship between a pair of datasets

Description

Create a relationship between two datasets, dataset_1 and dataset_2. By default, this function establishes a directed relationship with dataset_1 as the parent. If dataset_2 is not specified, the function creates a primary key for dataset_1.

Usage

join_key(dataset_1, dataset_2 = dataset_1, keys, directed = TRUE)

Value

object of class join_key_set to be passed into join_keys function.

Arguments

dataset_1, dataset_2

(character(1)) Dataset names. When dataset_2 is omitted, a primary key for dataset_1 is created.

keys

(optionally named character) Column mapping between the datasets, where names(keys) maps columns in dataset_1 corresponding to columns of dataset_2 given by the elements of keys.

• If unnamed, the same column names are used for both datasets.

• If any element of the keys vector is empty with a non-empty name, then the name is used for both datasets.

directed

(logical(1)) Flag that indicates whether it should create a parent-child relationship between the datasets.

• TRUE (default) dataset_1 is the parent of dataset_2;

• FALSE when the relationship is undirected.

See Also

join_keys(), parents()

Examples

join_key("d1", "d2", c("A"))
join_key("d1", "d2", c("A" = "B"))
join_key("d1", "d2", c("A" = "B", "C"))