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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 relational model, Describe relational model? Structure of rela... Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages Describe models which define the operations on classes, Describe briefly mo... Describe briefly models which define the operations on classes. The three models which are used to define operations on classes are as: Object Model = data dictionary + Obje What is key, What is key ? Key - A single attribute or a combination of... What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is Determine the persistent object, Determine the Persistent object Persis... Determine the Persistent object Persistent object can be stored in one of the following: Files Cheap, permanent, simple storage Low level (Write, Read) Ap Explain the static or conservative two phase locking, Explain the Static or... Explain the Static or conservative Two Phase Locking: Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any opera Modifyand removing a sequence-sequences, Modify a sequence: ALTER SEQU... Modify a sequence: ALTER SEQUENCE SEQSS INCREMENT 2 MAXVALUE 3000; Removing a sequence: DROP SEQUENCE SEQSS; Division operation, To do the division operation R1 ÷ R2, R2 should be a co... To do the division operation R1 ÷ R2, R2 should be a correct subset of R1. In the following example R1 have attributes A and B and R2 have only attribute B so R2 is a correct subse File handling and classes, Write the C++ program having class name studenti... Write the C++ program having class name studentinfo, that is used to store the VU student information: This class should store your VUID, campus id, name and father name in the fol Database Models, Benefits and Limitations od Data Models? Benefits and Limitations od Data Models? Create a er diagram to show customer accounts, Information about a bank is ... Information about a bank is about customers and their account. Customer has a name, address that consists of house number, area and city, and one or more phone numbers. Account ha 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: +1-415-670-9521 Phone: +1-415-670-9521 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 relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Describe briefly models which define the operations on classes. The three models which are used to define operations on classes are as: Object Model = data dictionary + Obje
What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is
Determine the Persistent object Persistent object can be stored in one of the following: Files Cheap, permanent, simple storage Low level (Write, Read) Ap
Explain the Static or conservative Two Phase Locking: Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any opera
Modify a sequence: ALTER SEQUENCE SEQSS INCREMENT 2 MAXVALUE 3000; Removing a sequence: DROP SEQUENCE SEQSS;
To do the division operation R1 ÷ R2, R2 should be a correct subset of R1. In the following example R1 have attributes A and B and R2 have only attribute B so R2 is a correct subse
Write the C++ program having class name studentinfo, that is used to store the VU student information: This class should store your VUID, campus id, name and father name in the fol
Benefits and Limitations od Data Models?
Information about a bank is about customers and their account. Customer has a name, address that consists of house number, area and city, and one or more phone numbers. Account ha
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