DBMS notes - Tom Kleen
DBMS notes - Tom Kleen

... that MDB is the file extension for Access database files. This is the old extension. The newer (since Office 2007) file extension is ACCDB. You will see these often in your geodatabases. Examine the tables. Note:  Double-click on each table to open it. So far there's nothing different from Excel.  ...
DB Tuning Expert - SoftTree Technologies, Inc.
DB Tuning Expert - SoftTree Technologies, Inc.

... and tuning recommendations for more efficient resource utilization, higher transaction throughput, and faster query performance.” ...
Document
Document

... The basic syntax of SQL, with the keywords in bold type, is select from where The select keyword selects field(s) from a database, the from keyword selects table(s) from a database, and the where keyword specifies the condition or criteria for data query. ...
Chapter 7 Managing Data Resources
Chapter 7 Managing Data Resources

... Database Technology, Management, and Users Change isn't just something you experience by chance; in all likelihood, it will be required throughout the corporate structure. You need to get the nontechies talking and working with the techies, preferably together in a group that is responsible for data ...
WG3/4 – May 11, 2012 – Minutes
WG3/4 – May 11, 2012 – Minutes

... Reporting Unit: Reporting Unit is a child of Report. The reporting unit defines the location by which the summary data are organized by. The example data from Sandia had three different types of reporting units: 1) 8-digit HUCS, 2) Counties, and 3) State specific basins. The WSWC was able to load al ...
Spatial Concepts and Data Models
Spatial Concepts and Data Models

... •Identify the relational schema components for •entity Facility, its attributes and its relationships •Note an empty relation box in Fig. 2.5. Fill in its schema. ...
Relational Processing of Tape Databases
Relational Processing of Tape Databases

... Index File on Disk if Data is Segmented For segmented files, keep an index file on disk that shows which tape files have which records on them. For example, states 1,2 and 3 might be on tape 1. Tapes 2 and 3 might contain data for state 4. The directory would contain all of this information so your ...
Does Program Efficiency Really Mattery Anymore
Does Program Efficiency Really Mattery Anymore

... obs=O, depending on the options in effect. It will probably not have much effect on any other users. Other arguments of the program test the effects of adding bo~ columns and multiple rows (inth=,n_out=). You can use this handy program to test your system. When it blows up, you know you have reached ...
Session Title
Session Title

... Normalization eliminates duplicate data – Data “nuggets” stored in one place only – Makes it clear what the definitive version is ...
Chapter 7 - College of Business « UNT
Chapter 7 - College of Business « UNT

... The Object-Oriented Model • Object-oriented database model: uses objectoriented approach for the database structure • Encapsulation: combined storage of data and relevant procedures to process it – Allows object to be “planted” in different data sets ...
Advanced Aircraft Design-Certification Framework with Database
Advanced Aircraft Design-Certification Framework with Database

... the goals is viewed as the output of the process. So, that database systems continue to be a key aspect of computer science and engineering today. A database is in essence a collection of information that will exist in a period of time, information that is managed for a database management system (D ...
(R2) en standalone
(R2) en standalone

... ; Setup will not display any user interface. QUIET="False" ; Setup will display progress only without any user interaction. QUIETSIMPLE="False" ; Specifies that Setup should install into WOW64. This command line argument is not supported on an IA64 or a 32-bit system. X86="False" ; Detailed help for ...
text
text

... what a SELECT… FROM… WHERE… query does – it uses the criteria we specify to create and return a new table from existing tables in a database. First ...
Chapter 6 Assignment
Chapter 6 Assignment

... The Object-Oriented Model • Object-oriented database model: uses objectoriented approach for the database structure • Encapsulation: combined storage of data and relevant procedures to process it – Allows object to be “planted” in different data sets ...
Chap13 Presentation
Chap13 Presentation

... Collection of data organized so you can access, retrieve, and use it  Database software allows you to • Create database • Add, change, and delete data • Sort and query database  Database software also is called database management system (DBMS) Next p. 13.2 ...
Lecture slide
Lecture slide

... • Attribute A1 is a foreign key of R1 referring to attribute A2 in R2, if 1) whenever there is a value v of A1, there is a tuple of R2 in which A2 has value v, and 2) A2 is a key of R2 – This is a special case of referential integrity: A2 must be a candidate key of R2 (e.g., CrsCode is a key of Cour ...
5e PP ch5 - Harbert College of Business
5e PP ch5 - Harbert College of Business

... Attribute Primary key Secondary keys ...
Title Body Technical Expertise Required Cost Additional Information
Title Body Technical Expertise Required Cost Additional Information

... table using a wizard, and advanced users can jump directly to an advanced table editor). OpenOffice Base also includes macro building tools, and the ability to connect to external database servers (including Access, mySQL, PostgresSQL, and other ODBC sources). Base does not allow for multi-user acce ...
available for here
available for here

... Blob (binary large objects) Date, datetime, timestamp, year, Enum, bool ...
Advanced SQL
Advanced SQL

... (inserted.account-number, inserted.branch-name, – inserted.balance) update account set balance = 0 from account, inserted where account.account-number = inserted.account-number end ...
Misconceptions About Real
Misconceptions About Real

... Concurrency control support Storage management ...
Final Presentation - Levi D. Smith Games and Entertainment
Final Presentation - Levi D. Smith Games and Entertainment

... • Turn System Over to Lockheed ...
eCommerce&Security - DCU School of Computing
eCommerce&Security - DCU School of Computing

... • Active set and current row: + a set of tuples from a SELECT is called the active set + at any time we can only work with one tuple in the active set, called the current row ...
Completeness Information and its Application to Query Processing
Completeness Information and its Application to Query Processing

... ma.y be that a certain real world relationship is known to exist,, but not al! tllc n values are available. Such missing ...
Queries of Relatively Stable Data
Queries of Relatively Stable Data

... is named by the serial number of the affected tuple and contains that tuple in storage format. The affected tuples are marked invalid in stable. 6. Additions-A directory containing a file for each tuple that hass been added since the relation was last stabilized. Each such file is named by the seria ...

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.