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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.
how to find entities
INSERT INTO command : Values can be inserted for all columns or for the selected columns Values can be given by sub query. In place of values parameter substitution
Question 1 Describe the following- Clustering Indexing Question 2 Explain the following with suitable real time examples- Implementation of Integrity rules
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
What are the three data anomalies that are likely to occur as a result of data redundancy? Can data redundancy be completely eliminated in database approach? Why or why not? A
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
composite attribute
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
Multiple column Queries: Syntax: SELECT COLUMN1, COL2,...... FROM TABLE WHERE (COLUMN1, COL2, ...) IN (SELECT COLUMN1, COL2,.... FROM TABLE WHERE );
Explain the term- Periodic recomputation Periodic recomputation: Base values are often updated in bunches. Sometimes, it is possible to just recompute all derived attributes p
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