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Which of the operations constitute a basic set of operations for manipulating relational data?
Relational algebra operations constitute a basic set of operations for manipulating relational data.
Explain the disadvantages of creating a temporary table? If you have already created a temporary table with a shown name and attempting to create a second one with that nam
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
What are the types of reference?explain it with suitable examples? Object oriented language given the ability to refer the object attribute of the type can be referred to the s
Update Anomaly : This anomaly is occurred due to data redundancy. Redundant information makes updates more complex since, for example, varying the name of the instructor of MCS-014
I have to solve a problem using access
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
1. Use the Invoice table structure shown below to answer the following questions: a) Draw the dependency diagram and identify the primary key and all dependencies, including al
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
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