Skip to contents

Add a dimension table to a multistar

Source: R/multistar_add_dimension.R
add_dimension.Rd

To add a dimension table to a multistar object, we must indicate the name that we give to the dimension, the tibble that contains the data and the name of the attribute corresponding to the table primary key.

Usage

add_dimension(
  ms,
  dimension_name = NULL,
  dimension_table = NULL,
  dimension_key = NULL,
  fact_name = NULL,
  fact_key = NULL,
  key_as_data = FALSE
)

# S3 method for class 'multistar'
add_dimension(
  ms,
  dimension_name = NULL,
  dimension_table = NULL,
  dimension_key = NULL,
  fact_name = NULL,
  fact_key = NULL,
  key_as_data = FALSE
)

Arguments

ms

A multistar object.

dimension_name

A string, name of dimension table.

dimension_table

A tibble, dimension table.

dimension_key

A string, name of the dimension primary key.

fact_name

A string, name of fact table.

fact_key

A string, name of the dimension foreign key.

key_as_data

A boolean, define the primary key as an attribute of the dimension accessible in queries?

Value

A multistar.

Details

We cannot add a dimension without defining a correspondence with one of the multistar's fact tables. We have to define the name of the fact table and the name of its foreign key. The referential integrity of the instances of the facts is checked.

The attribute that is used as the primary key will no longer be accessible for queries (its function is considered to be exclusively related to facts). If you want to use it for queries, it must be explicitly indicated by the boolean parameter key_as_data.

See also

Other multistar functions: add_facts(), multistar(), relate_dimension()

Examples


ms <- multistar() |>
  add_facts(
    fact_name = "mrs_age",
    fact_table = mrs_fact_age,
    measures = "n_deaths",
    nrow_agg = "count"
  ) |>
  add_facts(
    fact_name = "mrs_cause",
    fact_table = mrs_fact_cause,
    measures = c("pneumonia_and_influenza_deaths", "other_deaths"),
    nrow_agg = "nrow_agg"
  ) |>
  add_dimension(
    dimension_name = "where",
    dimension_table = mrs_where,
    dimension_key = "where_pk",
    fact_name = "mrs_age",
    fact_key = "where_fk"
  ) |>
  add_dimension(
    dimension_name = "when",
    dimension_table = mrs_when,
    dimension_key = "when_pk",
    fact_name = "mrs_age",
    fact_key = "when_fk",
    key_as_data = TRUE
  ) |>
  add_dimension(
    dimension_name = "who",
    dimension_table = mrs_who,
    dimension_key = "who_pk",
    fact_name = "mrs_age",
    fact_key = "who_fk"
  )