Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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 Attribute, composite attribute composite attribute Describe physical data independence, Describe Physical Data independence ? ... Describe Physical Data independence ? Physical Data Independence - It is capacity to modify the internal schema without having to change conceptual schema. Therefore, the exter Define integrity, (a) Explain briefly the three parts of a relational Model... (a) Explain briefly the three parts of a relational Model. (b) Contrast the following terms with an appropriate example: (i) stored attribute v/s derived attribute (ii) en Differentiate between key and superkey, Differentiate between Key and super... Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o Commercial database architecture, At its most essential level the DBMS arch... At its most essential level the DBMS architecture can be divide into two parts: the back end and the front end. The back end is responsible for managing the physical database an Write the queries in relational algebra, Problem: You are given the fol... Problem: You are given the following schema 1. Flights(flno, from, to, distance) 2. Aircraft(aid, flno, aname, cruisingRange) 3. Certified(eid, aid) 4. Employees(eid, ena Explain displaying an er schema as an er diagram, Explain the conventions f... Explain the conventions for displaying an ER schema as an ER diagram? An E-R Diagram scheme might describe certain constraints to that the contents of a database must conform. Derived horizontal fragmentation, atient(PNumber, Name, NHS_no, Amount_due,... atient(PNumber, Name, NHS_no, Amount_due, DNO, Doctor, Medical_Treatment), relation of schema Staff(StaffNum, Name, DNO, Task) and relation of schema Dept(DNO, Name, Location, Dire EER models, Ask question #MinimThe Georgia Tech Library (GTL) has approxima... Ask question #MinimThe Georgia Tech Library (GTL) has approximately 16,000 members, 100,000 titles, and 250,000 volumes (an average of 2.5 copies per book). About 10 percent of the Demonstrate the uml model, Demonstrate the UML model Using UML, it is p... Demonstrate the UML model Using UML, it is possible to generate code in any of the programming language from UML model (called forward engineering) and rebuild a model from an 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.
composite attribute
Describe Physical Data independence ? Physical Data Independence - It is capacity to modify the internal schema without having to change conceptual schema. Therefore, the exter
(a) Explain briefly the three parts of a relational Model. (b) Contrast the following terms with an appropriate example: (i) stored attribute v/s derived attribute (ii) en
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
At its most essential level the DBMS architecture can be divide into two parts: the back end and the front end. The back end is responsible for managing the physical database an
Problem: You are given the following schema 1. Flights(flno, from, to, distance) 2. Aircraft(aid, flno, aname, cruisingRange) 3. Certified(eid, aid) 4. Employees(eid, ena
Explain the conventions for displaying an ER schema as an ER diagram? An E-R Diagram scheme might describe certain constraints to that the contents of a database must conform.
atient(PNumber, Name, NHS_no, Amount_due, DNO, Doctor, Medical_Treatment), relation of schema Staff(StaffNum, Name, DNO, Task) and relation of schema Dept(DNO, Name, Location, Dire
Ask question #MinimThe Georgia Tech Library (GTL) has approximately 16,000 members, 100,000 titles, and 250,000 volumes (an average of 2.5 copies per book). About 10 percent of the
Demonstrate the UML model Using UML, it is possible to generate code in any of the programming language from UML model (called forward engineering) and rebuild a model from an
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd