colum database focus on _ structure
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A column-oriented DBMS (or columnar database management system) is a database management system (DBMS) that stores data tables by column rather than by row. ... Both row and columnar databases can become the backbone in a system to serve data for common extract, transform, load (ETL) and data visualization tools.
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A columnar database stores data by columns rather than by rows, which makes it suitable for analytical query processing, and thus for data warehouses. ... They're often used in data warehouses, the structured data repositories that businesses use to support corporate decision-making.
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