what is columnar layout and explain its unity
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Div tags are structural elements that let you create divisions within a page to organize the information into combinations of adjacent, hierarchical, and/or overlapping sectio
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A columnar database is a database management system (DBMS) that stores data in columns instead of rows. The goal of a columnar database is to efficiently write and read data to and from hard disk storage in order to speed up the time it takes to return a query.
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