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Objectives After reading this part, you should be able to: Modify, create, and delete database schema objects; Update database using SQL command; Retrieve data f
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF. Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relati
What is a candidate key? Minimal super keys are known as candidate keys.
Determine the Derived attribute to avoid re-computation Each class box consists of an ordered list of attributes and operations, each represented as a next string. We can find
Explain the challenges before an E-business management.
sir we want er diagram of bank management system in this main menu option as new account,deposit amount,withdraw amount,all acount holder list,modify account,close account
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
Sequences Sequences: Automatically produce unique numbers Are sharable Are typically used to make a primary key value Replace application code Speed up t
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