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What is a columnar Database and which is the GCP Solution?

A. A SQL Database organized in columns instead of rows. Cloud SQL may act as a columnar Database
B.  noSQL Database: Cloud Datastore
C. A BigData Solution: Cloud Dataprep
D. A noSQL Database: Cloud BigTable

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Correct Answer D
Bigtable is a NoSQL wide-columnar database.
Wide-column and petabyte-scale database store tables that can have a large and variable number of columns, that may be grouped in families.

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