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4 Cards in this Set
- Front
- Back
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LEFT JOIN keyword? |
It returns all rows from the left table with the matching rows in the right. |
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A view? |
View is a virtual table based on the result-set of an sql statement. It contains rows and columns just like a real table. |
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MongoDB? |
It is document-oriented database. Like NoSQL database, MongoDB avoids the traditional table-based relational database structure, but it is JSON-LIKE document with dynamic schemas to be easier and faster. |
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Parallel querying in database? |
Parallel query works by creating several parallel query processes that divide the workload of a sql statement. These processes operate on objects in parallel and can therefore greatly reduce overall execution time. |
