COSC 5040 – Distributed Database Design
... Assume that an order can be shipped from several warehouses. Specify the foreign keys for this schema using the following format. Schema (Table) Name Attribute #1 Attribute #2 ...
... Assume that an order can be shipped from several warehouses. Specify the foreign keys for this schema using the following format. Schema (Table) Name Attribute #1 Attribute #2 ...
Miami University
... process, clearly indicate the normal form that the considered relation is in, the reason for it, and what you are proposing to do to convert it to equivalent relations that are in a higher normal form. After the conversion, write the new relations in the relational notation, and draw dependency diag ...
... process, clearly indicate the normal form that the considered relation is in, the reason for it, and what you are proposing to do to convert it to equivalent relations that are in a higher normal form. After the conversion, write the new relations in the relational notation, and draw dependency diag ...
Relational Model - The Stanford University InfoLab
... Relation for a weak entity set must include attributes for its complete key (including those belonging to other entity sets), as well as its own, nonkey attributes. A supporting relationship is redundant and yields no relation (unless it has attributes). ...
... Relation for a weak entity set must include attributes for its complete key (including those belonging to other entity sets), as well as its own, nonkey attributes. A supporting relationship is redundant and yields no relation (unless it has attributes). ...
SQL - Department of Computer Science
... Uses terms table, rows, columns for the formal relational model terms relations, tuple, and attribute. An SQL schema is identified by a schema name, including authorization identifier to indicate user who owns it and descriptions for each element. Schema elements include tables, constraints, views, ...
... Uses terms table, rows, columns for the formal relational model terms relations, tuple, and attribute. An SQL schema is identified by a schema name, including authorization identifier to indicate user who owns it and descriptions for each element. Schema elements include tables, constraints, views, ...
CS206 --- Electronic Commerce
... Relation for a weak entity set must include attributes for its complete key (including those belonging to other entity sets), as well as its own, nonkey attributes. A supporting relationship is redundant and yields no relation (unless it has attributes). ...
... Relation for a weak entity set must include attributes for its complete key (including those belonging to other entity sets), as well as its own, nonkey attributes. A supporting relationship is redundant and yields no relation (unless it has attributes). ...
CS206 --- Electronic Commerce
... Relation for a weak entity set must include attributes for its complete key (including those belonging to other entity sets), as well as its own, nonkey attributes. A supporting (double-diamond) relationship is redundant and yields no relation. ...
... Relation for a weak entity set must include attributes for its complete key (including those belonging to other entity sets), as well as its own, nonkey attributes. A supporting (double-diamond) relationship is redundant and yields no relation. ...
Lecture 10 Creating and Maintaining Geographic Databases
... Columns = object states (properties, attributes) ...
... Columns = object states (properties, attributes) ...
Ch05_updated - KSU Faculty Member websites
... Constraints IC. • A relational Database State DB of S is a set of relation states DB= { r1,r2,…rm} such that each ri is a state of Ri and such that the ri relation states satisfy the integrity constraints specified in IC. • A database state that does not obey all the integrity constraints is called ...
... Constraints IC. • A relational Database State DB of S is a set of relation states DB= { r1,r2,…rm} such that each ri is a state of Ri and such that the ri relation states satisfy the integrity constraints specified in IC. • A database state that does not obey all the integrity constraints is called ...
X-Data: Test Data Generation for Killing SQL Mutants
... Create dataset where all relations have a set of matching tuples For each relation ri, generate a dataset where rest of relations ...
... Create dataset where all relations have a set of matching tuples For each relation ri, generate a dataset where rest of relations ...
Nested Queries
... Each individual NULL value considered to be different from every other NULL value SQL uses a three-valued logic: ...
... Each individual NULL value considered to be different from every other NULL value SQL uses a three-valued logic: ...
Slides
... 2. There isn’t a subquery 3. The list in the SELECT clause includes enough attributes that for every tuple inserted into the view, we can fill the other attributes out with NULL or the default, and have a tuple that will yield the inserted tuple of the view. ...
... 2. There isn’t a subquery 3. The list in the SELECT clause includes enough attributes that for every tuple inserted into the view, we can fill the other attributes out with NULL or the default, and have a tuple that will yield the inserted tuple of the view. ...
An Overview of Data Models
... – optimized by the compiler » e.g., compiler can choose the best available sorting algorithm for the relation to be sorted ...
... – optimized by the compiler » e.g., compiler can choose the best available sorting algorithm for the relation to be sorted ...
Data Warehousing – CG124
... – Connolly/Begg, 'Database Systems: A Practical Approach to Design, Implementation, and Management', Addison-Wesley, Latest Edition, 2004/5 – Elmasri/Navathe, ‘Fundamentals of Database Systems’, Addison-Wesley, ...
... – Connolly/Begg, 'Database Systems: A Practical Approach to Design, Implementation, and Management', Addison-Wesley, Latest Edition, 2004/5 – Elmasri/Navathe, ‘Fundamentals of Database Systems’, Addison-Wesley, ...
Document
... must be satisfied for the values of a foreign key? Foreign key (FK) is defined as follows: i) Consider two relation schemas R1 and R2; ii) The attributes in FK in R1 have the same domain(s) as the primary key attributes PK in R2; the attributes FK are said to reference or refer to the relation R2; i ...
... must be satisfied for the values of a foreign key? Foreign key (FK) is defined as follows: i) Consider two relation schemas R1 and R2; ii) The attributes in FK in R1 have the same domain(s) as the primary key attributes PK in R2; the attributes FK are said to reference or refer to the relation R2; i ...
lecture06
... • Sorting: convert a relation into a list of tuples. • Duplicate elimination: turn a bag into a set by eliminating duplicate tuples. • Grouping: partition the tuples of a relation into groups, based on their values among specified attributes. • Aggregation: used by the grouping operator and to ...
... • Sorting: convert a relation into a list of tuples. • Duplicate elimination: turn a bag into a set by eliminating duplicate tuples. • Grouping: partition the tuples of a relation into groups, based on their values among specified attributes. • Aggregation: used by the grouping operator and to ...
CS 338 The Relational Data Model and Relational Database
... Characteristics of Relations Major research Relation –set of n tuples, where each tuple is an ordered list of m values • Tuples in a relation have no particular order • Alternative: Ordering of values in a tuple (attributes in a relation schema) is unnecessary (at abstract level) Correspondence b ...
... Characteristics of Relations Major research Relation –set of n tuples, where each tuple is an ordered list of m values • Tuples in a relation have no particular order • Alternative: Ordering of values in a tuple (attributes in a relation schema) is unnecessary (at abstract level) Correspondence b ...
Chapter-03
... defined to be a set of unique tuples or rows. A relation schema specifies the domain of each field or column in the relation instance. These domain constraints in the schema specify an important condition that we want each instance of the relation to satisfy. The values that appear in a column ...
... defined to be a set of unique tuples or rows. A relation schema specifies the domain of each field or column in the relation instance. These domain constraints in the schema specify an important condition that we want each instance of the relation to satisfy. The values that appear in a column ...
Relation
... • a view is a named query (result is usually computed when the view is used) create view WatVendors as select VNo, VName, VBal from Vendor where City = 'Waterloo'; • views can be used in retrieval exactly like tables (but updates of views are restricted) ...
... • a view is a named query (result is usually computed when the view is used) create view WatVendors as select VNo, VName, VBal from Vendor where City = 'Waterloo'; • views can be used in retrieval exactly like tables (but updates of views are restricted) ...
No Slide Title
... key value must match a candidate key value of some tuple in its home relation or foreign key value must be wholly null. ...
... key value must match a candidate key value of some tuple in its home relation or foreign key value must be wholly null. ...
Simple Database Mathematics and the Query Converter
... Query Converter (qconv) tool, and which supports the generation of both natural language and of graphical ER diagrams. ...
... Query Converter (qconv) tool, and which supports the generation of both natural language and of graphical ER diagrams. ...
Supporting Join Queries
... If there are > 1 relevant producers, then our mediator probably needs an execution engine! - HARD! In any case, we know that some R-GMA users are defining Archivers and querying these directly. However: ...
... If there are > 1 relevant producers, then our mediator probably needs an execution engine! - HARD! In any case, we know that some R-GMA users are defining Archivers and querying these directly. However: ...