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Relational Model


Is proposed by Codd in the year 1970, that Moment model is network and hierarchy. In this time model relational become elementary and dominant data model at pledge product of SMBD. Used wide of by various vendor like Informix, Oracle, Sybase, Access, SQL Server, FoxBase, Paradox. Database represent corps from one or more relationship. Each relationship represent the tables of which consist of column and line. Its advantage in comparison with model previous data is its data representation modestly and is easy to expressed in the form of query.
Especial construction of data representation in model of relational is relationship. Relationship consist of relationship scheme and example relationship. Relationship scheme representation lead column / field of tables. Example of relationship is tables. Scheme Relationship : determining the name of relationship, name of the each field (column / attribute) and domain from each field. Domain which is mould have the name of appropriate value corps and domain. Relationship scheme determine domain to every field. Domain at every field basically is type of field. Relationship by using SQL. SQL use word of is tables of to express relationship. Condition of which is specified at database scheme of relational and limit data able to be kept in database example of relational. Kinds of definition integrity :
• Definition Key
• Definition Lock Guest
• Definition Public
Query represent question concerning data while its answer consist of new relationship which load result. Language of query represent special language which used to write down query. SQL represent language of query commercial which most popular for the SMBD of relational. Model of ER very according to depict database design early owning high level. Conducted by of approach to yield database scheme of relational which is very come near ER design.

Is proposed by Codd in the year 1970, that Moment model is network and hierarchy. In this time model relational become elementary and dominant data model at pledge product of SMBD. Used wide of by various vendor like Informix, Oracle, Sybase, Access, SQL Server, FoxBase, Paradox. Database represent corps from one or more relationship. Each relationship represent the tables of which consist of column and line. Its advantage in comparison with model previous data is its data representation modestly and is easy to expressed in the form of query.
Especial construction of data representation in model of relational is relationship. Relationship consist of relationship scheme and example relationship. Relationship scheme representation lead column / field of tables. Example of relationship is tables. Scheme Relationship : determining the name of relationship, name of the each field (column / attribute) and domain from each field. Domain which is mould have the name of appropriate value corps and domain. Relationship scheme determine domain to every field. Domain at every field basically is type of field. Relationship by using SQL. SQL use word of is tables of to express relationship. Condition of which is specified at database scheme of relational and limit data able to be kept in database example of relational. Kinds of definition integrity :
• Definition Key
• Definition Lock Guest
• Definition Public
Query represent question concerning data while its answer consist of new relationship which load result. Language of query represent special language which used to write down query. SQL represent language of query commercial which most popular for the SMBD of relational. Model of ER very according to depict database design early owning high level. Conducted by of approach to yield database scheme of relational which is very come near ER design.

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