Query
class Query
Used to execute a SQL query against table(s) in Redivis, using the Redivis SQL query syntax, and read out the results.
Constructors
Examples
# Execute any SQL query and read the results
query <- redivis::query("SELECT 1 + 1 AS two, 'foo' AS bar")
query$to_tibble()
# two bar
# 0 2 foo
# The query can reference any table on Redivis
query <- redivis::query("
SELECT *
FROM demo.iris_species.iris
WHERE SepalLengthCm > 5
")
query::to_tibble()
# Id SepalLengthCm SepalWidthCm PetalLengthCm PetalWidthCm Species
# 0 33 5.2 4.1 1.5 0.1 Iris-setosa
# ...
# Other methods to read data:
# query$to_arrow_batch_reader()
# query$to_arrow_dataset()
# query$to_arrow_dataset()
# query$to_data_frame()
# query$to_data_table()
# query$to_sf_tibble()
# To simplify table references, execute a query scoped to a dataset or project
dataset = redivis.organization("Demo").dataset("CMS 2014 Medicare Data")
query = dataset.query("""
SELECT
hospice_providers.name,
inpatient_charges.drg_definition
-- The tables inpatient_chargers, hospice_providers are assumed to be
-- within the scoped dataset
FROM inpatient_charges
INNER JOIN hospice_providers
ON hospice_providers.provider_id = inpatient_charges.provider_id
""")
# In a notebook, all queries are scoped to the current project.
# Additionally, the notebooks source table can simply be referenced as _source_
query = redivis.query("SELECT * FROM _source_ LIMIT 10")
Fields
Methods
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