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2. Oracle Rdb - Wikipedia

   en.wikipedia.org/wiki/Oracle_Rdb

   (example: "file.SCO" is pre-compiled into "file.COB") placing the SQL statements in a file external to the source code; this separate file is converted to object code by the "SQL Module Language" compiler, and the source code then references these SQL statements and, after compilation, the two are joined by the OpenVMS linker .

3. Attribute (computing) - Wikipedia

   en.wikipedia.org/wiki/Attribute_(computing)

   An attribute in a relational database can be represented as a column or field. In computing, an attribute is a specification that defines a property of an object, element, or file. It may also refer to or set the specific value for a given instance of such. For clarity, attributes should more correctly be considered metadata. An attribute is ...

4. Category:Free database management systems - Wikipedia

   en.wikipedia.org/wiki/Category:Free_database...

   Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... Pages in category "Free database management systems"

5. Codd's 12 rules - Wikipedia

   en.wikipedia.org/wiki/Codd's_12_rules

   Codd's twelve rules [1] are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be considered relational, i.e., a relational database management system (RDBMS).

6. Entity–attribute–value model - Wikipedia

   en.wikipedia.org/wiki/Entity–attribute–value...

   Attribute–value pairs are widely used for diverse applications, such as configuration files (using a simple syntax like attribute = value). An example of non-database use of EAV is in UIMA (Unstructured Information Management Architecture), a standard now managed by the Apache Foundation and employed in areas such as natural language processing.

7. Candidate key - Wikipedia

   en.wikipedia.org/wiki/Candidate_key

   The columns in a candidate key are called prime attributes, [3] and a column that does not occur in any candidate key is called a non-prime attribute. Every relation without NULL values will have at least one candidate key: Since there cannot be duplicate rows, the set of all columns is a superkey, and if that is not minimal, some subset of ...

8. List of column-oriented DBMSes - Wikipedia

   en.wikipedia.org/wiki/List_of_column-oriented_DBMSes

   Database name Language implemented in Notes Apache Doris Java & C++ Open source (since 2017), database for high-concurrency point queries and high-throughput analysis. Apache Druid: Java Started in 2011 for low-latency massive ingestion and queries. Support and extensions available from Imply Data. Apache Kudu: C++

9. Relation (database) - Wikipedia

   en.wikipedia.org/wiki/Relation_(database)

   Relation, tuple, and attribute represented as table, row, and column respectively. In database theory, a relation, as originally defined by E. F. Codd, [1] is a set of tuples (d 1,d 2,...,d n), where each element d j is a member of D j, a data domain. Codd's original definition notwithstanding, and contrary to the usual definition in ...