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What is called a query -execution engine?
The query implementation engine takes a query evaluation plan, implements that plan, and returns the answers to the query.
what is Mapping Constraints? with examples
1) Information about a bank is about customers and their account. Customer has a name, address which consists of house number, area and city, and one or more phone numbers. Ac
Describe logical data independence ? Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application p
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
Waterfall model is the linear model. The process is completed by step by step. We couldn't stop in between of the process. Prototype model: after get the model by low cost budget o
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
how to design tables
A set of possible data values is called? A set of possible data values is called as domain.
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
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