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Explain Foreign Key?
Foreign Key - Let there are two relations (tables) R and S. Any candidate key of the relation R that is referred within the relation S is known as the foreign key within the relation S and referenced key in the relation R. The relation R is also known as parent table and relation S is also known as child table.
We define a view in SQL through using the create view command. To describe a view, we must provide the view a name and must state the query in which computers the view. The form of
Explain different categories of failures that occur in Oracle database? Categories of Failures - In Oracle database subsequent types of failures can occurred: Statement Failu
Explain what is RDBMS ? RDBMS - RDBMS is a database management system (DBMS) which stores data within the form of relations. Relational databases are powerful since they need f
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
What is called block-level striping? Block level striping stripes blocks across many disks. It treats the array of disks as a large disk, and provides blocks logical numbers
What is relationship? Give examples A relationship is an association between several entities. Example: A depositor relationship associates a customer with every account tha
how many hourse have been spent on a certain project
Explain the term - Adjustment of inheritance The inheritance can be enlarged as object design progresses by changing class structure. The designer should do: i) Adjust or r
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
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