DBMS-Relational Algebra and Calculus

DBMS-Relational Algebra and Calculus
1. In 1980 Dr. E.F. Codd was working with Oracle Corporation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
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2. DB2, System R, and ORACLE are examples of relational DBMS.
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3. In the RDBMS terminology, a table is called a relation.
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4. The relational model is based on the core concept of relation.
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5. Cardinality of a table means the number of columns in the table.
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6. In the RDBMS terminology, an attribute means a column or a filed.
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7. A domain is a set of atomic values
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8. Data values are assumed to be atomic, which means that they have no internal structure as far as the model is concerned.
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9. A table cannot have more than one attribute, which can uniquely identify the rows.
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10. A candidate key is an attribute that can uniquely identify a row in a table.
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