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A secondary key is a field that is identified as being suitable for indexing the data such as a surname, It is used to sort the data in a different order to the primary key, A table can have many secondary keys in fact every field could be a secondary key. Hope this helps !
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What type of databases are those whose data can be organized into a two dimensional table?
The type of databases that can organize data into a two-dimensional table are called relational databases. In a relational database, data is organized into tables consisting of rows and columns. The tables can then be related to each other through common fields, enabling efficient data retrieval and manipulation. Common examples of relational databases include MySQL, Oracle, and Microsoft SQL Server.
Do keyfields link data together in a database?
Keyfields crosslink related records in different tables of Relational Databases. But in other kinds of databases (e.g. navigational databases, object oriented databases, flat file databases) other different mechanisms are used or the linking of records is not supported.
What is the least accurate description of relational databases Choose one answer a They minimize redundancy in data b They are made up of multiple tables c They maintain?
A
Difference between primary and secondary sequence database?
Primary sequence databases contain raw sequence data derived from the sequencing of genes etc. whereas secondary sequence databases contain information that is derived from primary sequence databases. For example this could be active site residues of protein families that were found by carrying out multiple sequence alignments on the raw primary sequence database data for a set of related proteins. Primary sequence databases can be nucleic databases (such as EMBL, GenBank or DDBJ) or protein databases (such as Swiss-PROT or trEMBL). An example of a secondary sequence database is PROSITE.
What databases might be useful to store data?
There are several databases that might be useful to store data, depending on the specific needs and requirements of the project. Common options include relational databases like MySQL and PostgreSQL, NoSQL databases like MongoDB and Cassandra, and graph databases like Neo4j. The choice of database should be based on factors such as data structure, volume, speed, scalability, and the querying needs of the application.
Is Excel an example of a relational database?
No. It is a spreadsheet application. You can do simple databases in it, but it is not designed to create complex databases like relational databases. To do that you would use an actual database application.
What has the author Chao-Chih Yang written?
Chao-Chih Yang has written: 'Relational databases' -- subject(s): Relational databases
What has the author David Maier written?
David Maier has written: 'The theory of relational databases' -- subject(s): Database management, Relational databases
What is the importance of relational database?
Importance of relational database----------------------------------------------Relational databases can be considered as stores of information grouped together logically. Relational databases are used in all data related jobs. Especially in today's world of information, relational databases have increased importance, since they are used to store, manage, and retrieve data in a managed, organised and logical way. More information on relational databases, and their importance, can be found in detail here: http://tinyurl.com/relationaldatabase
What has the author Stefan Stanczyk written?
Stefan Stanczyk has written: 'Theory and practice of relational databases' -- subject(s): Relational databases, Database management
What kind of database exist?
The two major commercial classes of database are; relational and non-relational. Example of non-relational databases include Informix c-isam and dbisam. The main relational databases are; MS SQL Server, Sybase, Oracle, Progress, mySQL.
Compare contrast relational databases object-relational databases and object-oriented databases Site an example or scenario where each type is best used?
A relational database is structure to recognize relations among information, and stores the information in tables. An object-oriented database focuses on presenting the information in the form of objects, to be used for object-oriented programming. Object-relational databases are a hybrid of the two, keeping relations stored but still keeping the object-type data. Relational databases are best for presentation of the data itself, while object-oriented databases are better for deriving new information from given information.
Example of ralational databases?
Microsoft Access is a relational database.
Database management the origin and its growth in sql?
E. F. Codd introduced the term in his seminal paper "A Relational Model of Data for Large Shared Data Banks", published in 1970. In this paper and later papers he defined what he meant by relational. One well-known definition of what constitutes a relational database system is Codd's 12 rules. However, many of the early implementations of the relational model did not conform to all of Codd's rules, so the term gradually came to describe a broader class of database systems. Relational databases, as implemented in relational database management systems, have become a predominant choice for the storage of information in new databases used for financial records, manufacturing and logistical information, personnel data and much more. Relational databases have often replaced legacy hierarchical databases and network databases because they are easier to understand and use, even though they are much less efficient. As computer power has increased, the inefficiencies of relational databases, which made them impractical in earlier times, have been outweighed by their ease of use. However, relational databases have been challenged by Object Databases, which were introduced in an attempt to address the object-relational impedance mismatch in relational database, and XML databases. http://en.wikipedia.org/wiki/Relational_... http://en.wikipedia.org/wiki/Relational_...
In relational databases tables are linked to each other through a?
common field
What is an example of a standard query language used in relational databases?
The standard query language for relational databases, as adopted by the American National Standards Institute (ANSI), is SQL, which is generally understood to be an abbreviation for "structured query language."
What has the author T H Merrett written?
T. H. Merrett has written: 'Relational information systems' -- subject(s): Relational databases
