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Define instance and schema?
Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database.
Schema: The overall design of the data base is known as the data base schema.
What is database utility? Database utility is the interface among the ABAP/4 Dictionary and the underlying the SAP system.
how many types of data model in DBMS? explain data abstraction with its different level
Consistency: This property makes sure that a complete transaction implementation takes a database from one consistent state to another consistent state. If the transaction fails e
What is Multivalued Attribute? Multivalued Attribute - Multivalued attribute might have more than one value for an entity. For instance, PreviousDegrees of a STUDENT.
what is check point in database management system
Define multivalued dependency. What do understand by trivial multivalued dependency? Ans: A multivalued dependency is a full constraint among two sets of attributes in a rela
what is definition hierarchical data model
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
What are the advantages of creating a table from existing table?
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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