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Added BigQuery database driver
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‎Makefile‎

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SOURCE ?= file go_bindata github github_ee bitbucket aws_s3 google_cloud_storage godoc_vfs gitlab
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DATABASE ?= postgres mysql redshift cassandra spanner cockroachdb yugabytedb clickhouse mongodb sqlserver firebird neo4j pgx
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DATABASE ?= postgres mysql redshift cassandra spanner cockroachdb yugabytedb clickhouse mongodb sqlserver firebird neo4j pgx bigquery
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DATABASE_TEST ?= $(DATABASE) sqlite sqlite3 sqlcipher
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VERSION ?= $(shell git describe --tags 2>/dev/null | cut -c 2-)
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TEST_FLAGS ?=

‎README.md‎

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* [ClickHouse](database/clickhouse)
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* [Firebird](database/firebird)
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* [MS SQL Server](database/sqlserver)
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* [BigQuery (Beta)](database/bigquery)
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### Database URLs
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‎database/bigquery/.gitignore‎

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tmp/
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!tmp/.gitkeep

‎database/bigquery/README.md‎

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# BigQuery (Beta)
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* Driver works with Google Cloud BigQuery
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* [Examples](./examples)
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### Usage
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`bigquery://https://www.googleapis.com/bigquery/v2:443?x-migrations-table=schema_migrations&x-statement-timeout=0&credentials_filename=./myproject-XXXXXXXXXXXXX-XXXXXXXXXXXX.json&project_id=myproject-XXXXXXXXXXXXX&dataset_id=mydataset`
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### System variables reference
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https://cloud.google.com/bigquery/docs/reference/system-variables
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| Key | WithInstance Config | Default | Description |
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|--------------------------|---------------------|--------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `x-migrations-table` | `MigrationsTable` | schema_migrations | Name of the migrations table |
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| `x-statement-timeout` | `StatementTimeout` | 0 | Abort any statement that takes more than the specified number of milliseconds |
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| `credentials_filename` | - | - | The location of a credential JSON file. |
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| `project_id` | - | - | The current Google Cloud project ID. |
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| `dataset_id` | `DatasetID` | - | ID of the default dataset in the current project. This ID is used when a dataset is not specified for a project in the query. You can use the SET statement to assign @@dataset_id to another dataset ID in the current project. The system variables @@dataset_project_id and @@dataset_id can be set and used together. |
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| `dataset_project_id` | `DatasetProjectID` | the same as `project_id` | ID of the default project that's used when one is not specified for a dataset used in the query. If @@dataset_project_id is not set, or if it is set to NULL, the query-executing project (@@project_id) is used. You can use the SET statement to assign @@dataset_project_id to another project ID. The system variables @@dataset_project_id and @@dataset_id can be set and used together. |
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| `query_label` | `QueryLabel` | NULL | Query label to associate with query jobs in the current multi-statement query or session. If set in a query, all subsequent query jobs in the script or session will have this label. If not set in a query, the value for this system variable is NULL. For an example of how to set this system variable, see Associate jobs in a session with a label. |
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| `time_zone` | `TimeZone` | UTC | The default time zone to use in time zone-dependent SQL functions, when a time zone is not specified as an argument. @@time_zone can be modified by using a SET statement to any valid time zone name. At the start of each script, @@time_zone begins as “UTC”. |
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### Environment variables:
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- https://cloud.google.com/docs/authentication/application-default-credentials#GAC
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| Key | Description |
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|--------------------------------|--------------------------------------------------|
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| GOOGLE_APPLICATION_CREDENTIALS | The location of a credential JSON file. |
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### Data definition language (DDL) statements in Google Standard SQL
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https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language
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### Work with multi-statement queries
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https://cloud.google.com/bigquery/docs/multi-statement-queries
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