purchase - Binus Repository
... database special method of mapping between different data model are needed • We should ideally be able to access all of local data via the global model ...
... database special method of mapping between different data model are needed • We should ideally be able to access all of local data via the global model ...
SELECT CustomerName
... Use the INNER JOIN to join a table to itself The AS word must be used to give each table a distinct name so that references to columns can be made unique Example: SELECT E.EmployeeName,M.EmployeeName FROM Personnel AS E INNER JOIN Personnel as M ON E.ManagerID = M.EmployeeID ...
... Use the INNER JOIN to join a table to itself The AS word must be used to give each table a distinct name so that references to columns can be made unique Example: SELECT E.EmployeeName,M.EmployeeName FROM Personnel AS E INNER JOIN Personnel as M ON E.ManagerID = M.EmployeeID ...
COP4540 Database Management System Midterm Review
... Ch3. Relational Model Ch4. Relational Algebra Ch19. Normal Forms Ch5. SQL ...
... Ch3. Relational Model Ch4. Relational Algebra Ch19. Normal Forms Ch5. SQL ...
customer-city
... 2.For every “there exists” subformula of the form x (P1(x)), the subformula is true if an only if P1(x) is true for all values x from dom(P1). 3. For every “for all” subformula of the form x (P1 (x)), the subformula is true if and only if P1(x) is true for all values x from dom (P1). ...
... 2.For every “there exists” subformula of the form x (P1(x)), the subformula is true if an only if P1(x) is true for all values x from dom(P1). 3. For every “for all” subformula of the form x (P1 (x)), the subformula is true if and only if P1(x) is true for all values x from dom (P1). ...
Database Management Systems
... Give Relational Algebra statements for the following queries on the Bookstore database schema. [20 pts] Syntax for Relational Algebra expressions: condition(relation) attribute-list(relation) relation1 OP relation2, where OP is , , - , , , and ||cond new-rel(attr) R.A. expression ...
... Give Relational Algebra statements for the following queries on the Bookstore database schema. [20 pts] Syntax for Relational Algebra expressions: condition(relation) attribute-list(relation) relation1 OP relation2, where OP is , , - , , , and ||cond new-rel(attr) R.A. expression ...
Slide 4-9
... Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Ramez Elmasri and Shamkant Navathe ...
... Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Ramez Elmasri and Shamkant Navathe ...
Polaris: A System for Query, Analysis, and Visualization of
... • interface simplicity: clearly defined semantics and operations • code simplicity: composable language versus monolithic objects • declarative: can state what, not how— allows for optimization, etc. ...
... • interface simplicity: clearly defined semantics and operations • code simplicity: composable language versus monolithic objects • declarative: can state what, not how— allows for optimization, etc. ...
CS 122
... An introduction to relational databases and the SQL query language. Database design using Entity-Relationship, relational, and object-oriented data modeling; database implementation with relations, views, indexes, stored procedures, and triggers; use of SQL query language including selection, join, ...
... An introduction to relational databases and the SQL query language. Database design using Entity-Relationship, relational, and object-oriented data modeling; database implementation with relations, views, indexes, stored procedures, and triggers; use of SQL query language including selection, join, ...
marked
... for each tuple tr in r do begin for each tuple ts in s do begin test pair (tr,ts) to see if they satisfy the join condition if they do, add tr • ts to the result. end end r is called the outer relation and s the inner relation of the join. Requires no indices and can be used with any kind of j ...
... for each tuple tr in r do begin for each tuple ts in s do begin test pair (tr,ts) to see if they satisfy the join condition if they do, add tr • ts to the result. end end r is called the outer relation and s the inner relation of the join. Requires no indices and can be used with any kind of j ...
First normal form
... is an intrinsic and meaningful aspect of the view.[13] This violates condition 1. The tuples in true relations are not ordered with respect to each other. • A table with at least one nullable attribute. A nullable attribute would be in violation of condition 4, which requires every field to contain e ...
... is an intrinsic and meaningful aspect of the view.[13] This violates condition 1. The tuples in true relations are not ordered with respect to each other. • A table with at least one nullable attribute. A nullable attribute would be in violation of condition 4, which requires every field to contain e ...
Complexity and Approximation of Fixing Numerical Attributes in
... The Gist: COUNT DISTINCT Aggregation CQA under range semantics for COUNT DISTINCT acyclic conjunctive queries and one 1AD is coNP -complete By reduction from MAX-SAT with instance P = U, C, K; U a set of variables, C collection of clauses over U , K a positive integer Introduce relation Var (u, C1 ...
... The Gist: COUNT DISTINCT Aggregation CQA under range semantics for COUNT DISTINCT acyclic conjunctive queries and one 1AD is coNP -complete By reduction from MAX-SAT with instance P = U, C, K; U a set of variables, C collection of clauses over U , K a positive integer Introduce relation Var (u, C1 ...
PPT
... Indexing: If a selection or join condition is specified, use an index to examine just the tuples that satisfy the condition. Iteration: Examine all tuples in an input table, one after the other.( Some times we can examine index entries if the fields we are interested in are in index key ). Partition ...
... Indexing: If a selection or join condition is specified, use an index to examine just the tuples that satisfy the condition. Iteration: Examine all tuples in an input table, one after the other.( Some times we can examine index entries if the fields we are interested in are in index key ). Partition ...
ppt
... • Data cubes invite materialized views that are aggregations in one or more dimensions. • Dimensions may not be completely aggregated --- an option is to group by an attribute of the dimension table. ...
... • Data cubes invite materialized views that are aggregations in one or more dimensions. • Dimensions may not be completely aggregated --- an option is to group by an attribute of the dimension table. ...
Introduction to Database and DBMS
... 3. Relational databases put data into independent tables (files). Users can then link the tables as they wish with many to many relationships. They are slower than network and hierarchical databases, but they are more flexible. 4. Object-oriented databases are even more flexible than relational data ...
... 3. Relational databases put data into independent tables (files). Users can then link the tables as they wish with many to many relationships. They are slower than network and hierarchical databases, but they are more flexible. 4. Object-oriented databases are even more flexible than relational data ...
Document
... Statistical information about relations. Examples: number of tuples, number of distinct values for an attribute Statistics estimation for intermediate results to compute cost of complex expressions Cost formula for algorithms (Ch12), computed using statistics Database System Concepts - 6th ...
... Statistical information about relations. Examples: number of tuples, number of distinct values for an attribute Statistics estimation for intermediate results to compute cost of complex expressions Cost formula for algorithms (Ch12), computed using statistics Database System Concepts - 6th ...
The Relational Model - Simon Fraser University
... Also delete all Enrolled tuples that refer to it. Disallow deletion of a Students tuple that is referred to. Set sid in Enrolled tuples that refer to it to a default sid. In SQL, also: Set sid in Enrolled tuples that refer to it to a special value null, denoting `unknown’ or `inapplicable’. ...
... Also delete all Enrolled tuples that refer to it. Disallow deletion of a Students tuple that is referred to. Set sid in Enrolled tuples that refer to it to a default sid. In SQL, also: Set sid in Enrolled tuples that refer to it to a special value null, denoting `unknown’ or `inapplicable’. ...
MCA 304 DATABASE MANAGEMENT SYSTEMS
... Entity Sets to Tables, Relationship Sets to Tables, Translating, Relationship Sets with Key Constraints. Translating Relationship Sets with Participation Constraints, Translating Weak Entity Sets, Translating Class Hierarchies. Translating E-R Diagrams with Aggregation, Introduction to Query Languag ...
... Entity Sets to Tables, Relationship Sets to Tables, Translating, Relationship Sets with Key Constraints. Translating Relationship Sets with Participation Constraints, Translating Weak Entity Sets, Translating Class Hierarchies. Translating E-R Diagrams with Aggregation, Introduction to Query Languag ...
Chapter 8 review
... E.g. SUM(SalesTotal), AVG(Age) COUNT COUNT(*): Use this most of the time, to count all rows COUNT(Attribute): Will count rows for that attribute only if they are not NULL ...
... E.g. SUM(SalesTotal), AVG(Age) COUNT COUNT(*): Use this most of the time, to count all rows COUNT(Attribute): Will count rows for that attribute only if they are not NULL ...
4.9 Codd`s Rules for a Relational Database Management System In
... rules or principles that a database management system must use to be considered "fully relational". (Codd, E.F. “Is Your DBMS Really Relational?”, Computerworld, Oct 14, 1985; “Does Your DBMS Run by the Rules?”, Computerworld, Oct. 21, 1985) Codd wanted to maintain the integrity of the relational mo ...
... rules or principles that a database management system must use to be considered "fully relational". (Codd, E.F. “Is Your DBMS Really Relational?”, Computerworld, Oct 14, 1985; “Does Your DBMS Run by the Rules?”, Computerworld, Oct. 21, 1985) Codd wanted to maintain the integrity of the relational mo ...