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Tables have key fields, which can be used to identify unique records. Keys relate tables to each other. The rows of the relation are also called tuples, and there is one tuple component for each attribute ? or column ? in that relation. A relation or table name, along with those relation's attributes, make up the relational schema. Relational Database models are server-centric.
When designing a Relational Database, you must create a table for each entity type, choose or invent a primary key for each table; add foreign keys to represent one-to-many relationships; create new tables to represent many-to-many relationships; define referential integrity constraints; evaluate schema quality and make necessary improvements; and choose appropriate data types and value restrictions for each field (if necessary)...
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