branch-name - VUB STARLab
... relational algebra. It is used to list the attributes desired in the result of a query. Find the names of all branches in the loan relation select branch-name from loan In the “pure” relational algebra syntax, the query would be: branch-name(loan) An asterisk in the select clause denotes “all ...
... relational algebra. It is used to list the attributes desired in the result of a query. Find the names of all branches in the loan relation select branch-name from loan In the “pure” relational algebra syntax, the query would be: branch-name(loan) An asterisk in the select clause denotes “all ...
branch-name
... average account balance is greater than $1200. select branch-name, avg-balance from (select branch-name, avg (balance) from account group by branch-name) as result (branch-name, avg-balance) where avg-balance > 1200 Note that we do not need to use the having clause, since we compute the temporary (v ...
... average account balance is greater than $1200. select branch-name, avg-balance from (select branch-name, avg (balance) from account group by branch-name) as result (branch-name, avg-balance) where avg-balance > 1200 Note that we do not need to use the having clause, since we compute the temporary (v ...
A,r
... nr: number of tuples in a relation r. (tuple/relation) br: number of blocks containing tuples of r. (block/relation) lr: size of a tuple of r. (byte/tuple) fr: blocking factor of r — i.e., the number of tuples of r ...
... nr: number of tuples in a relation r. (tuple/relation) br: number of blocks containing tuples of r. (block/relation) lr: size of a tuple of r. (byte/tuple) fr: blocking factor of r — i.e., the number of tuples of r ...
Complexity Results for Manipulation, Bribery and
... Since strategic behavior in collective decision making is generally considered to be (socially) undesirable, a lot of research effort has been invested in diagnosing what social choice procedures are resistant to strategic behavior, and under what conditions. An important research direction along th ...
... Since strategic behavior in collective decision making is generally considered to be (socially) undesirable, a lot of research effort has been invested in diagnosing what social choice procedures are resistant to strategic behavior, and under what conditions. An important research direction along th ...
Chapter 14: Query Optimization
... 7. The selection operation distributes over the theta join operation under the following two conditions: (a) When all the attributes in 0 involve only the attributes of one of the expressions (E1) being joined. 0E1 ...
... 7. The selection operation distributes over the theta join operation under the following two conditions: (a) When all the attributes in 0 involve only the attributes of one of the expressions (E1) being joined. 0E1 ...
Ch.8 - Faculty Website Listing
... Constraints, including FDs, are costly to check in practice unless they pertain to only one relation. If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency pre ...
... Constraints, including FDs, are costly to check in practice unless they pertain to only one relation. If it is sufficient to test only those dependencies on each individual relation of a decomposition in order to ensure that all functional dependencies hold, then that decomposition is dependency pre ...
Installing BIRT iServer for Windows - BIRT Developer Center
... this document may be reproduced or transmitted in any form, or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of Actuate Corporation. © 1995 - 2012 by Actuate Corporation. All rights reserved. Printed in the United States of Ameri ...
... this document may be reproduced or transmitted in any form, or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of Actuate Corporation. © 1995 - 2012 by Actuate Corporation. All rights reserved. Printed in the United States of Ameri ...
Keyword Search over Relational Databases: A Metadata Approach
... on relational data that take into consideration metadata [21][31], they provide only partial solutions to the problem, and they only use the metadata as a way to improve their technique. In this work, we propose a novel technique for answering keyword queries over relational databases. The queries a ...
... on relational data that take into consideration metadata [21][31], they provide only partial solutions to the problem, and they only use the metadata as a way to improve their technique. In this work, we propose a novel technique for answering keyword queries over relational databases. The queries a ...
PPT of Chapter 2 - North South University
... Let r(R) and s(S) be relations, and let S R r s = R-S (r ) – R-S ( ( R-S (r ) x s ) – R-S,S(r )) ...
... Let r(R) and s(S) be relations, and let S R r s = R-S (r ) – R-S ( ( R-S (r ) x s ) – R-S,S(r )) ...
Chapter 2: Relational Model
... key of another relation. The attribute is called a foreign key. E.g. customer_name and account_number attributes of depositor are foreign keys to customer and account respectively. Only values occurring in the primary key attribute of the referenced relation may occur in the foreign key attribut ...
... key of another relation. The attribute is called a foreign key. E.g. customer_name and account_number attributes of depositor are foreign keys to customer and account respectively. Only values occurring in the primary key attribute of the referenced relation may occur in the foreign key attribut ...
Chapter 2: Relational Model
... Let r(R) and s(S) be relations, and let S R r s = R-S (r ) – R-S ( ( R-S (r ) x s ) – R-S,S(r )) ...
... Let r(R) and s(S) be relations, and let S R r s = R-S (r ) – R-S ( ( R-S (r ) x s ) – R-S,S(r )) ...
mod-3
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints And as we will see later, also other information such as ...
... The SQL data-definition language (DDL) allows the specification of information about relations, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints And as we will see later, also other information such as ...
Composing Schema Mappings - University of California, Santa Cruz
... The language should be sufficiently high-level to secure physical data independence, i.e., the separation between the physical level and the conceptual level of databases. The language should have high enough expressive power to be able to pose useful and interesting queries against the database ...
... The language should be sufficiently high-level to secure physical data independence, i.e., the separation between the physical level and the conceptual level of databases. The language should have high enough expressive power to be able to pose useful and interesting queries against the database ...
Relational Databases, Logic, and Complexity
... The language should be sufficiently high-level to secure physical data independence, i.e., the separation between the physical level and the conceptual level of databases. The language should have high enough expressive power to be able to pose useful and interesting queries against the database ...
... The language should be sufficiently high-level to secure physical data independence, i.e., the separation between the physical level and the conceptual level of databases. The language should have high enough expressive power to be able to pose useful and interesting queries against the database ...
RelationalModel
... Attributes in the resulting relation, including their types and names. Which tuples will be included in the result. ...
... Attributes in the resulting relation, including their types and names. Which tuples will be included in the result. ...
Chapter 2: Relational Model
... Let r(R) and s(S) be relations, and let S R r s = R-S (r ) – R-S ( ( R-S (r ) x s ) – R-S,S(r )) ...
... Let r(R) and s(S) be relations, and let S R r s = R-S (r ) – R-S ( ( R-S (r ) x s ) – R-S,S(r )) ...
Installing BIRT iServer for Windows - BIRT Developer Center
... part of this document may be reproduced or transmitted in any form, or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of Actuate Corporation. © 1995 - 2011 by Actuate Corporation. All rights reserved. Printed in the United States ...
... part of this document may be reproduced or transmitted in any form, or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of Actuate Corporation. © 1995 - 2011 by Actuate Corporation. All rights reserved. Printed in the United States ...
from instructor - CSE, IIT Bombay
... Let’s Try Writing Some Queries in SQL Some queries to be written….. Find the salary of the instructor with ID 10101 Find titles of all courses in the Comp. Sci. department Find course ID, year and semester of all courses taken by any ...
... Let’s Try Writing Some Queries in SQL Some queries to be written….. Find the salary of the instructor with ID 10101 Find titles of all courses in the Comp. Sci. department Find course ID, year and semester of all courses taken by any ...
Chapter5. Other Relational Languages
... average account balance is more than $1,200, we simply add the condition box: ...
... average account balance is more than $1,200, we simply add the condition box: ...
Installing BIRT iServer for Linux and UNIX
... part of this document may be reproduced or transmitted in any form, or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of Actuate Corporation. © 1995 - 2011 by Actuate Corporation. All rights reserved. Printed in the United States ...
... part of this document may be reproduced or transmitted in any form, or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of Actuate Corporation. © 1995 - 2011 by Actuate Corporation. All rights reserved. Printed in the United States ...
Zvi`s changes, if any, are marked in green, they are not copyrighted
... holds on R if and only if for any legal relations r(R), whenever any two tuples t1 and t2 of r agree on the attributes a, they also agree on the attributes b. That is, t1[a] = t2 [a] t1[b ] = t2 [b ] Example: Consider r(A,B) with the following instance of r. ...
... holds on R if and only if for any legal relations r(R), whenever any two tuples t1 and t2 of r agree on the attributes a, they also agree on the attributes b. That is, t1[a] = t2 [a] t1[b ] = t2 [b ] Example: Consider r(A,B) with the following instance of r. ...
Accounting Information Systems: The Crossroads of Accounting and IT
... Objective: Q2.2 What is the role of the database in the enterprise? 15) How are hierarchical databases and network databases similar? How are they different? Answer: Hierarchical databases and network databases are similar in that they store data in records that are not grouped into database tables. ...
... Objective: Q2.2 What is the role of the database in the enterprise? 15) How are hierarchical databases and network databases similar? How are they different? Answer: Hierarchical databases and network databases are similar in that they store data in records that are not grouped into database tables. ...
Chapter 11: Indexing and Hashing
... Sparse Index: contains index records for only some of the search-key values. It is applicable only as primary index, i.e. when the records are physically ...
... Sparse Index: contains index records for only some of the search-key values. It is applicable only as primary index, i.e. when the records are physically ...