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Explain retrieval in QBE?
Retrieval in QBE : A "GUI" for expressing queries.
But has influenced many projects Especially PC Databases: Paradox, Access, etc.
Define Outer join Outer join - If there are any type of values in the one table that do not have corresponding value(s) in the other, in an equi-join which will not be selected
What are data models? Explain it detail? Entity relationship model Rectangles Ellipse Diamonds Lines Relational model Relational model use a collection
Step 1 . Using Oracle, create the tables identified in the preferred solution for Assignment 2. Technicians (ZipCode, TechnicianID, FirstName, LastName, Street, City, State, Home
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
Explain the main advantages of DBMS over File Oriented System ?
State about the Use Case Diagram A use case diagram represents a set of use cases, actors and their relationships. These diagrams shall be used to model context or requirement
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
word limit no mentioned
List the string operations supported by SQL? 1) Pattern matching Operation 2) Concatenation 3) Extracting character strings 4) Converting among uppercase and lower cas
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