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query_external_gcs_temporary_table.py
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query_external_gcs_temporary_table.py
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# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
def query_external_gcs_temporary_table():
# [START bigquery_query_external_gcs_temp]
from google.cloud import bigquery
# Construct a BigQuery client object.
client = bigquery.Client()
# Configure the external data source and query job.
external_config = bigquery.ExternalConfig("CSV")
external_config.source_uris = [
"gs://cloud-samples-data/bigquery/us-states/us-states.csv"
]
external_config.schema = [
bigquery.SchemaField("name", "STRING"),
bigquery.SchemaField("post_abbr", "STRING"),
]
external_config.options.skip_leading_rows = 1
table_id = "us_states"
job_config = bigquery.QueryJobConfig(table_definitions={table_id: external_config})
# Example query to find states starting with 'W'.
sql = 'SELECT * FROM `{}` WHERE name LIKE "W%"'.format(table_id)
query_job = client.query(sql, job_config=job_config) # Make an API request.
w_states = list(query_job) # Wait for the job to complete.
print("There are {} states with names starting with W.".format(len(w_states)))
# [END bigquery_query_external_gcs_temp]