google-big-queryHow can I use Google BigQuery to query a JSON string?

Google BigQuery is a powerful query engine that can be used to query JSON strings. To use BigQuery to query a JSON string, one must first upload the JSON string to a BigQuery table. This can be done with the bq command line tool, or through the BigQuery web UI.

Once the JSON string is uploaded to a BigQuery table, it can be queried using the standard SQL syntax. For example, the following query will return all records in the table:

SELECT * FROM `mydataset.mytable`;

The output of this query will be a list of records, each of which is a JSON string. To query specific fields from the JSON string, the JSON_EXTRACT function can be used. For example, the following query will return the name field from each record in the table:

SELECT JSON_EXTRACT(record, '$.name') FROM `mydataset.mytable`;

The output of this query will be a list of the name fields from each record.

In addition to querying JSON strings, BigQuery can also be used to manipulate JSON strings. This can be done using the JSON_EXTRACT_SCALAR and JSON_SET functions. For example, the following query will update the name field of all records in the table to John Doe:

UPDATE `mydataset.mytable`
SET record = JSON_SET(record, '$.name', 'John Doe');

For more information on how to use BigQuery to query and manipulate JSON strings, please refer to the BigQuery JSON Functions documentation.

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