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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.
what is primary key
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
Distributed Database Management System
external and internal mapping with examples
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Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples. Insert operation can violet any of the subse
notes about update opreation
The technique of converting the state diagram to code a) Identify all major control paths. Start from initial state; choose a path across the diagram that corresponds to normal
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 •
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