Subschema control structure file

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Subschema and view of Access under the multi-user

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The Boolean operations of partial compatible relation and their application in subschema query language

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This limit the user 's visit to the database table of Access only in subschema . It enhances the security coefficient of database and atonement the security problem of Access .

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Their characters are discussed and their applications in subschema query language are introduced .

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A data schema especially a data subschema in a relational data system .

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The thesis expounds the structure of the traffic measure unit and makeup of subschema .

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