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is the number of attributes (a table's columns). For example, a relation with two attributes and three values can be represented as a table with two columns and three rows, or as a two-dimensional graph with three points. The table and graph representations are only equivalent if the ordering of rows
501:
An external table is a table that is NOT stored within the Oracle database. Data is loaded from a file via an access driver (normally ORACLE_LOADER) when the table is accessed. One can think of an external table as a view that allows running SQL queries against files on a filesystem
179:
being the unit where a row and column intersect. A table has a specified number of columns, but can have any number of rows. Each row is identified by one or more values appearing in a particular column subset. A specific choice of columns which uniquely identify rows is called the
330:, representing the rows of a table in each row of the file and each column in a row. This structure implies that a row can have repeating information, generally in the child data segments. Data are stored in sequence of physical records.
281:. Similarly, representation as a table implies a particular ordering to the rows and columns, whereas a relation is explicitly unordered. However, the database system does not guarantee any ordering of the rows unless an
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You use external tables to load and unload data to or from your database. You can also use external tables to query data in text files that are not in an
Informix database.
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table can potentially contain duplicate rows, whereas a true relation cannot contain duplicate rows that we call
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all containing the same fields or columns. The implementation consists of a list of
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introduced external tables read-only from the Oracle database. In Oracle 10
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supporting the table abstraction. Conceptually, it is a list of records or
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The data in a table does not have to be physically stored in the database.
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OCP: Oracle 10g New
Features for Administrators Study Guide: Exam 1Z0-040
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of databases, a table can be considered a convenient representation of a
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is a set of data elements (values) using a model of vertical
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is not significant, and the table has no duplicate rows.
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on the table or on the values within particular columns.
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An equally valid representation of a relation is as an
520:. John Wiley & Sons (published 2006). p. 90.
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In many systems for computational statistics, such as
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60:. Unsourced material may be challenged and removed.
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222:, for example) can also be thought of as views.
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514:Bryla, Bob; Thomas, Biju (20 February 2006).
140:is a collection of related data organized in
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346:of a column is ordinarily defined by the
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120:Learn how and when to remove this message
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1071:Relational database management systems
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433:"SQL Guide: Tables, rows, and columns"
171:(identifiable by name) and horizontal
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195:(bag) of rows where a relation is a
58:adding citations to reliable sources
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187:"Table" is another term for
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464:. IBM Informix 12.10. IBM
261:Tables versus relations
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952:Database normalization
895:Query rewriting system
324:hierarchical databases
318:Hierarchical databases
972:Referential integrity
69:"Table" database
962:Distributed database
462:IBM Knowledge center
257:, each with a name.
157:relational databases
54:improve this article
982:Relational calculus
860:Concurrency control
388:Table (information)
368:Relation (database)
161:flat file databases
977:Relational algebra
921:Query optimization
726:Armstrong's axioms
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110:December 2009
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43:This article
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531:. Retrieved
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413:(definition)
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52:Please help
47:verification
44:
1035:WikiProject
926:Replication
814:Transaction
756:Foreign key
736:CAP theorem
683:Multi-model
442:11 December
340:spreadsheet
313:Comparisons
205:constraints
182:primary key
1050:Categories
900:Query plan
853:Components
771:Unique key
688:comparison
622:comparison
612:Relational
605:comparison
533:2015-08-14
496:2015-08-14
490:Oracle FAQ
468:2015-08-14
394:References
243:data table
239:data frame
203:, such as
189:"relation"
80:newspapers
909:Functions
844:Partition
671:In-memory
629:Key–value
338:Unlike a
247:data type
1015:Category
931:Sharding
787:Relation
761:Superkey
716:Database
709:Concepts
538:Oracle 9
407:"cell",
362:See also
344:datatype
304:, where
284:ORDER BY
271:relation
216:Informix
201:metadata
193:multiset
134:database
1025:Outline
824:Trigger
780:Objects
417:May 29,
169:columns
146:columns
94:scholar
839:Cursor
797:column
666:NewSQL
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492:. 2015
356:SQLite
348:schema
342:, the
290:SELECT
279:tuples
235:pandas
231:Python
220:Oracle
175:, the
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829:Index
792:table
695:Cloud
661:NoSQL
656:Graph
593:Types
302:chart
245:is a
212:Views
165:table
138:table
132:In a
101:JSTOR
87:books
880:ODBC
870:JDBC
809:View
746:Null
741:CRUD
721:ACID
676:list
639:list
617:list
522:ISBN
444:2013
419:2012
328:file
237:, a
229:and
177:cell
173:rows
163:, a
150:rows
148:and
136:, a
73:news
1061:SQL
875:XQJ
802:row
437:IBM
352:SQL
275:SQL
241:or
233:'s
218:or
197:set
155:In
56:by
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