单词 | Subschema |
例句 | 1 A data schema, especially a data subschema in a relational data system. 2 A subschema is a description of only that portion of the database pertinent to a particular user's needs. 3 Digraph will be constructed by using the dependence of the left of subset's FD. Some nodes will help to decompose a subschema of BCNF. The key of the subschema is the left or left's equivalence. 4 We must distinguish between a record type and a instance of the data-item types and record types stored in a database the term subschema refers to an collocation programmer's vies of the data he uses. 5 This artical is mainly expatiate on the process how foregrounding subschema been designed and run. |
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