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I have a large BigQuery table that has 50-100 columns. I would like a query to count how many of those column names start with the string "a_" and how many start with "e_".

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One way to do it is by using bq CLI tool:

bq --format=prettyjson show dataset.table | grep '"name": "a_' | wc -l

bq --format=prettyjson show dataset.table | grep '"name": "e_' | wc -l

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