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By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which records can be taken for deletion.
Constraints that can be violated during deletion
Only one type of constraint can be violated during deletion, it is referential integrity constraint. It can happen when you want to delete a record in the table where it is referenced by the foreign key of another table. Please read the example given below very carefully.
prototype of a distributed information system for a national car part retail outlet chain.
describe objectivde of file organisation
he SQL query that will return the order number, quantity ordered, price each and total cost of an order (quantity * price each) from the order details table. Label the calculated c
What is Relational calculus? Relational calculus is a Non- Procedural language.
Create a view emp_dep containing e_name and number of dependents from the tables employee and dependent of (i) CREATE VIEW emp_dept AS SELECT ename, COUNT(*) FROM employee, dep
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
Find out the names of all employees who work for first Bank Corporation from database. SELECT EMPLOYEE_NAME FROM WORKS WHERE COMPANYNAME = ‘First Bank Corporation';
OBJECTIVES After going through this unit you should be capable to: Explain the File Based system and its limitations; Explain the structure of DBMS; Explain the
Need For Distributed Database Systems A distributed database is a set of database kept on multiple computers that appears to applications as a one database. As a result, an app
If R1 and R2 are two relations or functions, then the result of R3 = R1 × R2 is the combination of tuples that are in R1 and R2. The product is associative and commutative. Degr
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