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A View may be defined of as a virtual table, that is, a table that does not really exist in its own right but is instead inferred from one or more underlying base data table. There is no stored file that direct shows the view instead a definition of view is loaded in data dictionary. Restructuring and growth of base tables is not shown in views. Thus the view may insulate end users from the effects of developing and growth in the database.
List the string operations supported by SQL? 1) Pattern matching Operation 2) Concatenation 3) Extracting character strings 4) Converting among uppercase and lower cas
What are the disadvantages of relational approach? Disadvantages of relational approach: • Substantial hardware and system software overhead • May not fit all business models •
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
Submit SQL INSERT Statements that will populate the database with sample data. You must insert at least 5 records into each table in your database.Submit your SQL INSERT Statement
What is Explicit update In explicit update, each derived attribute is defined with respect to one, or more fundamental base object(s). The object designer determines that de
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the
differences between a classified catalog and a dictionary catalog
what is er digram given that example of hospital,bank and library er digram.
comparison of oracle RDBMS with MySQL
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