Extract data from Cloud Spanner to GCS using Dataflow

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Extract data from Cloud Spanner
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[@ayush10_08]

How to automate the whole process?
So in order to use data flow we must have a knowledge of programming?
How dataflow got permission to write bq?

[@techtrapture]

Regarding question 1. We can automate using cloud function or schedule dataflow using airflow. I will be uploading a video on this in this week.
2. I used default service account for dataflow which by default have editor role. That's why dataflow got permission to write in BQ.