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Data Validation Examples

This page describes some basic use cases of the tool.

PLEASE NOTE: In below commands, my_bq_conn refers to the connection name for your BigQuery project. We are validating BigQuery tables that are available in BigQuery public datasets. These examples validate a table against itself for example purposes.

Also, note that if no aggregation flag is provided, the tool will run a 'COUNT *' as the default aggregation.

Simple COUNT(*) on a table

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips

Run multiple tables

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips,bigquery-public-data.new_york_citibike.citibike_stations

Store validation config to the file

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips -c citibike.yaml

Above command creates a YAML file named citibike.yaml that can be used to run validations in the future.

Please note: When the config-file (-c) option is provided, only the YAML file gets created. The validation doesn’t execute.

Run validations from a configuration file

data-validation run-config -c citibike.yaml

Above command executes validations stored in a config file named citibike.yaml.

Run COUNT validations for all columns

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --count '*'

Run COUNT validations for selected columns

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --count bikeid,gender

Run a checksum validation for all rows

data-validation validate row -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --primary-keys station_id --hash '*'

Store results in a BigQuery table

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --count tripduration,start_station_name -bqrh $YOUR_PROJECT_ID.pso_data_validator.results

Please replace $YOUR_PROJECT_ID with the correct project-id where you created your results datasets as mentioned in the installation section.

Query results from a BigQuery results table

SELECT
  run_id,
  validation_name,
  validation_type,
  group_by_columns,
  source_table_name,
  source_agg_value,
  target_agg_value,
  pct_difference,
  pct_threshold,
  difference,
  start_time
FROM
  `pso_data_validator.results`
ORDER BY
  start_time DESC

Run a single column GroupBy validation

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --grouped-columns bikeid

Run a multi-column GroupBy validation

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --grouped-columns bikeid,usertype

Apply single aggregation on a single field

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_stations --sum num_bikes_available

Apply single aggregation on multiple fields

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_stations --sum num_bikes_available,num_docks_available

Apply different aggregations on multiple fields

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_stations --sum num_bikes_available,num_docks_available --avg num_bikes_disabled,num_docks_disabled

Apply different aggregations on multiple fields and apply GroupBy

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_stations --grouped-columns region_id --sum num_bikes_available,num_docks_available --avg num_bikes_disabled,num_docks_disabled

Apply filters

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_stations --grouped-columns region_id --sum num_bikes_available,num_docks_available --filters 'region_id=71' -bqrh $YOUR_PROJECT_ID.pso_data_validator.results

Apply labels

data-validation validate column -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips --count tripduration,start_station_name -l tag=test-run,owner=name

Run a schema validation

data-validation validate schema -sc my_bq_conn -tc my_bq_conn -tbls bigquery-public-data.new_york_citibike.citibike_trips -bqrh $YOUR_PROJECT_ID.pso_data_validator.results

Run validation on a file

# Additional dependencies needed for GCS files
pip install gcsfs
pip install fsspec

data-validation connections add --connection-name file_conn FileSystem --table-name $FILE_NAME --file-path gs://path/to/file --file-type csv
data-validation connections add --connection-name my_bq_conn BigQuery --project-id $YOUR_PROJECT_ID

# Validate GCS CSV file with BigQuery table
data-validation validate column -sc file_conn -tc my_bq_conn -tbls $FILE_NAME=$YOUR_PROJECT_ID.dataset.table --count $COLUMN

Run custom SQL

data-validation query
  --conn connection-name The named connection to be queried.
  --query, -q The Raw query to run against the supplied connection

Sample YAML file (Grouped Column validation)

result_handler:
  project_id: my-project-id
  table_id: pso_data_validator.results
  type: BigQuery
  google_service_account_key_path: path/to/sa.json
source: my_bq_conn
target: my_bq_conn
validations:
- aggregates:
  - field_alias: count
    source_column: null
    target_column: null
    type: count
  - field_alias: sum__num_bikes_available
    source_column: num_bikes_available
    target_column: num_bikes_available
    type: sum
    cast: float64
  - field_alias: sum__num_docks_available
    source_column: num_docks_available
    target_column: num_docks_available
    type: sum
  filters:
  - source: region_id=71
    target: region_id=71
    type: custom
  grouped_columns:
  - cast: null
    field_alias: region_id
    source_column: region_id
    target_column: region_id
  labels:
  - !!python/tuple
    - description
    - test
  schema_name: bigquery-public-data.new_york_citibike
  table_name: citibike_stations
  target_schema_name: bigquery-public-data.new_york_citibike
  target_table_name: citibike_stations
  threshold: 0.0
  type: Column