Count the number of subjects that a cdm_table has.

Count the number of subjects that a cdm_table has.

Usage

numberSubjects(x)

Arguments

x

A cdm_table.

Value

An integer with the number of subjects in the table.

Examples

person <- dplyr::tibble(
  person_id = 1, gender_concept_id = 0, year_of_birth = 1990,
  race_concept_id = 0, ethnicity_concept_id = 0
)
observation_period <- dplyr::tibble(
  observation_period_id = 1, person_id = 1,
  observation_period_start_date = as.Date("2000-01-01"),
  observation_period_end_date = as.Date("2023-12-31"),
  period_type_concept_id = 0
)
cdm <- cdmFromTables(
  tables = list("person" = person, "observation_period" = observation_period),
  cdmName = "test"
)

numberSubjects(cdm$observation_period)
#> [1] 1