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Explain mechanism of nested queries?
SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common use of sub queries is to perform tests for set membership, make set comparisons, and verify set cardinality.
a) Set membership
(select customer-name
from depositor)
b) Set comparison
select distinct T.branch-name
from branch as T,branch as S
where T.assets > S.assets and S.branch-city='Brooklyn'
a) Test for Empty Relations
Select customer-name
from borrower
where exits (select *
from depositor
where depositor.customername=borrower.customer-name)
a) Test for the Absence of Duplicate Tuples
Describe DROP TABLE command of SQL along with both the options - CASCADE and RESTRICT. DROP TABLE command - This command drops the specified table. Dropping a table also dro
Define the terms i) DDL ii) DML DDL: Data base schema is specified by a set of definitions expressed by a special language known as a data def
Explain forms based and graphical interface? Forms based and graphical interface: graphical user interface (GUI) is a kind of user interface which permits people to interact
..
Define a table in SQL known as Client that is used to store information about the clients. Define CLIENT_NO as the primary key whose first letter must begin with ‘C'. Also ensure t
What is the max. no. Of structures that can be included in a table or structure. Nine.
Find out the names and company names of all employees sorted in ascending order of company name and descending order of employee names of by which company. SELECT EMPLOYEE_NAME,
Events4Fun is an event management company in Europe with branches in South America as well. The company is well-known for its efficiency, good-quality services, and affordable char
Derived horizontal fragmentation: Some applications may include a join of two or more relations. If the relations are stored at dissimilar locations, there may be a major overhead
average response time?
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