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Nested Queries
Let us see some more complex queries in this section.
Sub-queries:
Some of the basic concerns of sub-queries are:
SELECT
FROM
WHERE expr OPERATOR
(SELECT FROM WHERE); Operator has a comparison operator (one or multiple row operators) Single row operator: >, =, >=, <, <=, <> Multiple row operators: IN, ALL, ANY, Order by clause can't be used in sub-query, if specified it must be the end clause in the main select statement. Parts of sub-queries: ‰ Single row sub-query: It gives only single row from the inner select statement. ‰ Multiple row sub-queries: It gives more than single row from the inner select statement ‰ Multiple column sub-queries: It gives more than single column from the inner select statement. Single row operators are used with one row sub queries and multiple row operators are used with numerous row sub queries. The Inner and Outer queries can get data from different tables. Group Functions are used in sub queries. Related Discussions:- Nested queries Describe specialsation and generalization, Describe Specialsation and gener... Describe Specialsation and generalization? Specialisation /generalization: This is a top down and bottom up approach to the design of database. It displays the IS_A relation Database management system, Distributed Database Management System Distributed Database Management System Design a large scale system, Question: (a) Why is it important to know... Question: (a) Why is it important to know the architecture rather than to start requirement capture when designing a large scale system? (b) Who are the different people in What is a transaction? and how does it differs from update, wh wh What are the constituents of file, What are the Constituents of File? Also ... What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo Where does view definition stored, Where does view definition stored? ... Where does view definition stored? A view definition is permanently stored as part of the database. Explain alternate key, Explain Alternate key? Alternate Key - All the... Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys. What do you understand by raid, What do you understand by RAID? Explain RA... What do you understand by RAID? Explain RAID Level 4 and Level5? RAID - It is stands for Redundant Array of Inexpensive Disks (as named by the inventor), or alternatively Re Compare three clustering algorithms in weka, Compare three clustering algor... Compare three clustering algorithms in Weka. For this comparison, you will need to use at least two different datasets. Run the algorithms on the datasets, and use the visual Discuss along with examples about several types of er model, Discuss along ... Discuss along with examples about several types of attributes present in the ER model? Types of Attributes are: • SIMPLE attributes are attributes which are drawn from the ato Write Your Message! Name Email id Message Verfication Code Featured Services Online Tutoring Project Development Exam Preparation Course Help Assignment Help Order Now Popular Subjects Accounting Finance Economics Management Statistics HR Management Marketing Engineering Programming Computer Science Web Design Assured A++ Grade Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report! Submit Assignment Academics Physics Chemistry Biology Science Math English History Humanities Physiology Statistics Major Subjects Accounting Economics Finance Marketing Management HRM Management Operation Management Financial Management Operation Research Majors Perdisco Dissertation Essay Buy Thesis Literature Computer Science Computer Programming MATLAB Database Engineering University Help Q & A Help Get In Touch whatsapp: +91-977-207-8620 Phone: +91-977-207-8620 Email: [email protected] TERMS & POLICIES Privacy Policy Disclaimer Policy T&C Policy Copyright Act Refund & Cancellation HELP & SUPPORT Careers FAQs Directory Blog Contact Us All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd
Operator has a comparison operator (one or multiple row operators)
Single row operator: >, =, >=, <, <=, <>
Multiple row operators: IN, ALL, ANY,
‰ Single row sub-query: It gives only single row from the inner select statement.
‰ Multiple row sub-queries: It gives more than single row from the inner select statement
‰ Multiple column sub-queries: It gives more than single column from the inner select statement.
Single row operators are used with one row sub queries and multiple row operators are used with numerous row sub queries.
Describe Specialsation and generalization? Specialisation /generalization: This is a top down and bottom up approach to the design of database. It displays the IS_A relation
Distributed Database Management System
Question: (a) Why is it important to know the architecture rather than to start requirement capture when designing a large scale system? (b) Who are the different people in
wh
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
Where does view definition stored? A view definition is permanently stored as part of the database.
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
What do you understand by RAID? Explain RAID Level 4 and Level5? RAID - It is stands for Redundant Array of Inexpensive Disks (as named by the inventor), or alternatively Re
Compare three clustering algorithms in Weka. For this comparison, you will need to use at least two different datasets. Run the algorithms on the datasets, and use the visual
Discuss along with examples about several types of attributes present in the ER model? Types of Attributes are: • SIMPLE attributes are attributes which are drawn from the ato
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