Slides
... At query time we retrieve and multiply the scores of t in the lists Cx1,…,Cxs and in one of Gx1,…,Gxs. This requires only s+1 multiplications and results in a score2 that is proportional to the actual score. Two kinds of efficient access operations are needed: First, given a value x, it should be po ...
... At query time we retrieve and multiply the scores of t in the lists Cx1,…,Cxs and in one of Gx1,…,Gxs. This requires only s+1 multiplications and results in a score2 that is proportional to the actual score. Two kinds of efficient access operations are needed: First, given a value x, it should be po ...
Rel model/ER transform lecture
... attributes are included in the relation for multi-valued attributes, 2 new relations are created the first relation containing all of the simple attributes a second relation containing the primary key attribute of the first relation as an attribute & an attribute for the multi-valued attribute i ...
... attributes are included in the relation for multi-valued attributes, 2 new relations are created the first relation containing all of the simple attributes a second relation containing the primary key attribute of the first relation as an attribute & an attribute for the multi-valued attribute i ...
Introduction to Databases
... Adds new object storage capabilities to relational systems Objects, classes and inheritance are directly supported in database schemas and in the query language and supports extension of the data model with custom data-types and ...
... Adds new object storage capabilities to relational systems Objects, classes and inheritance are directly supported in database schemas and in the query language and supports extension of the data model with custom data-types and ...
Analytical Processing
... Comparing SQL-based and Multidimensional Analytical Processing Although the individual transaction details that support analysis may come from relational database management systems, the business view analysts use is a multidimensional description of information. Numerical items or measures (e.g., ...
... Comparing SQL-based and Multidimensional Analytical Processing Although the individual transaction details that support analysis may come from relational database management systems, the business view analysts use is a multidimensional description of information. Numerical items or measures (e.g., ...
PowerPoint Presentation - Austin Community College
... ODBC (Open Database Connectivity) is a standard Application Programming Interface (API) for accessing information from different database systems and different storage formats. The purpose of ODBC is to enable you to access a diverse selection of databases and data formats without having to learn th ...
... ODBC (Open Database Connectivity) is a standard Application Programming Interface (API) for accessing information from different database systems and different storage formats. The purpose of ODBC is to enable you to access a diverse selection of databases and data formats without having to learn th ...
Introduction to Big Data
... (Project-Join Normal Form) A join dependency (JD) can be said to exist if the join of R1 and R2 over C is equal to relation R; where R1 and R2 are the decompositions R1(A,B,C) and R2(C,D) of a given relation R(A,B,C,D). 4NF and every join dependency is a consequence of its relation (candidate) keys. ...
... (Project-Join Normal Form) A join dependency (JD) can be said to exist if the join of R1 and R2 over C is equal to relation R; where R1 and R2 are the decompositions R1(A,B,C) and R2(C,D) of a given relation R(A,B,C,D). 4NF and every join dependency is a consequence of its relation (candidate) keys. ...
database system
... list into several parts. One part for each theme in the list A Project List would be divided into a CUSTOMER Table, a PROJECT Table, and a ...
... list into several parts. One part for each theme in the list A Project List would be divided into a CUSTOMER Table, a PROJECT Table, and a ...
Lecture 6
... • Further, ProductId by itself is not a good choice either because the same product can be produced by more than one manufacturer. ...
... • Further, ProductId by itself is not a good choice either because the same product can be produced by more than one manufacturer. ...
Normalization
... Database Normalization Database normalization relates to the level of redundancy in a relational database’s structure. The key idea is to reduce the chance of having multiple different version of the same data. Well-normalized databases have a schema that reflects the true dependencies betwee ...
... Database Normalization Database normalization relates to the level of redundancy in a relational database’s structure. The key idea is to reduce the chance of having multiple different version of the same data. Well-normalized databases have a schema that reflects the true dependencies betwee ...
Informatica 9.0: Database Requirements
... user accounts. If you do not configure the database with these properties, you can encounter problems such as deployment failures or metadata inconsistencies when you run Informatica services. For more information about configuring the database, see the documentation for your database system. Databa ...
... user accounts. If you do not configure the database with these properties, you can encounter problems such as deployment failures or metadata inconsistencies when you run Informatica services. For more information about configuring the database, see the documentation for your database system. Databa ...
Database Management System - The Institute of Finance
... language for querying (and, like SQL, for creating and modifying) relational data. It is different from SQL, and from most other database query languages, in having a graphical user interface that allows users to write queries by creating example tables on the screen. ...
... language for querying (and, like SQL, for creating and modifying) relational data. It is different from SQL, and from most other database query languages, in having a graphical user interface that allows users to write queries by creating example tables on the screen. ...
Chapter 5 review
... (1,0):(0,1): Foreign key goes on whichever side will cause fewer nulls (1,1):(1,1): This relationship almost never exists in the real world. You probably made a mistake. Verify your cardinalities, or merge the two tables. Exception: this relationship is sometimes used for database performance ...
... (1,0):(0,1): Foreign key goes on whichever side will cause fewer nulls (1,1):(1,1): This relationship almost never exists in the real world. You probably made a mistake. Verify your cardinalities, or merge the two tables. Exception: this relationship is sometimes used for database performance ...
csis115Lecture18
... • If we delete Advisor 3, we lose all the information regarding the Marketing Department. • The structure of the table forces us to lose facts about 2 ...
... • If we delete Advisor 3, we lose all the information regarding the Marketing Department. • The structure of the table forces us to lose facts about 2 ...
Multiple Choice Questions
... ( D )32. Which of the following statements is not correct? A)Data normalization minimizes data redundancy B)There can only be a single primary key defined for each table C)Specifying a zero (0) for the lower bound for the association multiplicity on a class diagram indicates that the item is optiona ...
... ( D )32. Which of the following statements is not correct? A)Data normalization minimizes data redundancy B)There can only be a single primary key defined for each table C)Specifying a zero (0) for the lower bound for the association multiplicity on a class diagram indicates that the item is optiona ...
Mini-MSDD - Relational Databases
... about the entities. The various qualities (characteristics) of the entity that are to be described are referred to as attributes For each of these attributes for each entity there is potentially a value (taken from a legal set of values that obey certain constraints or rules) There is some structure ...
... about the entities. The various qualities (characteristics) of the entity that are to be described are referred to as attributes For each of these attributes for each entity there is potentially a value (taken from a legal set of values that obey certain constraints or rules) There is some structure ...
REVISING JOE`S DATABASE
... the database. They are the way data will be processed most of the time. A join is the process of combining tables to produce a new result. Multi-table queries in Access involve some type of join whether we specify it or not. Another difference between joins and queries is the use of indexes. An inde ...
... the database. They are the way data will be processed most of the time. A join is the process of combining tables to produce a new result. Multi-table queries in Access involve some type of join whether we specify it or not. Another difference between joins and queries is the use of indexes. An inde ...
Platform for Big Data, NoSQL and Relational Data. What
... An object contained within a user database Defines the scheme for the federation Represent the database being sharded Orders_federation Orders_federation ...
... An object contained within a user database Defines the scheme for the federation Represent the database being sharded Orders_federation Orders_federation ...
Databases and WWW
... – typically text databases store collections of non-connected documents – search of data is speeded up with search indexes • like indexes on books - cover the whole text • index item = (keyword, document,.., {weight, position} ) • there may be many index items pointing to the same document – documen ...
... – typically text databases store collections of non-connected documents – search of data is speeded up with search indexes • like indexes on books - cover the whole text • index item = (keyword, document,.., {weight, position} ) • there may be many index items pointing to the same document – documen ...
Introduction to Database Systems
... the game they found that the game servers were offline because of database problems.” • “Some players spent hours tuning their ingame characters only to find that crashes deleted all their hard work.” • Source: BBC News Online, July 1, 2003. ...
... the game they found that the game servers were offline because of database problems.” • “Some players spent hours tuning their ingame characters only to find that crashes deleted all their hard work.” • Source: BBC News Online, July 1, 2003. ...
Creating Tables 1
... Why not just omit the precision and scale? It defaults to the Maximum allowed by your hardware… ...
... Why not just omit the precision and scale? It defaults to the Maximum allowed by your hardware… ...
SQL
... // note: put strings in “quotation marks”! // char, varchar, and text are strings! // NULL should not be quoted // backslash escapes a mark, e.g., O’clock is written as ‘O\’clock’ //the SHA1() and NOW() are functions. //the SHA1() encripts data to a 40 character long string, hence //CHAR(40) is used ...
... // note: put strings in “quotation marks”! // char, varchar, and text are strings! // NULL should not be quoted // backslash escapes a mark, e.g., O’clock is written as ‘O\’clock’ //the SHA1() and NOW() are functions. //the SHA1() encripts data to a 40 character long string, hence //CHAR(40) is used ...
Object-Oriented Programming & Relational Design
... (hard disks), a reel to reel tape drive for backup purposes, a dot-matrix line printer and a bunch of [dumb] terminals. This was a high end machine, and even a minimally configured PDP-11 cost about $40,000. Despite the cost, 600 such installations had been put into service by the end of 1974, mostl ...
... (hard disks), a reel to reel tape drive for backup purposes, a dot-matrix line printer and a bunch of [dumb] terminals. This was a high end machine, and even a minimally configured PDP-11 cost about $40,000. Despite the cost, 600 such installations had been put into service by the end of 1974, mostl ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.