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A hierarchical query is a type of SQL query that handles hierarchical model data. They are special cases of more general recursive fixpoint queries, which compute transitive closures. In standard SQL:1999 hierarchical queries are implemented by way of recursive common table expressions (CTEs).
Oracle APEX (Oracle Application Express) is a low-code application development platform developed by Oracle Corporation. APEX is used for developing and deploying cloud, mobile and desktop applications. It has a web-based integrated development environment (IDE) that includes tools such as wizards, drag-and-drop layout builders, and property ...
Oracle Database is available by several service providers on-premises, on-cloud, or as a hybrid cloud installation. It may be run on third party servers as well as on Oracle hardware (Exadata on-premises, on Oracle Cloud or at Cloud at Customer). [5] Oracle Database uses SQL for database updating and retrieval. [6]
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
The consequence of this is that a different query plan is compiled and stored for each different length. In general, the maximum number of "duplicate" plans is the product of the lengths of the variable length columns as specified in the database. For this reason, it is important to use the standard Add method for variable length columns: command.
Any query whose WHERE clause specifies any combination of columns or column expressions that are an exact subset of those defined in a join index (a so-called "covering query") will cause the join index, rather than the original tables and their indexes, to be consulted during query execution. The Oracle implementation limits itself to using ...
ABAP, Apex, CSS, COBOL, Flex, Go, HTML, PHP, PLI, PL/SQL, Ruby, Swift, TSQL, Visual Basic 6, XML A continuous inspection engine that finds vulnerabilities, bugs and code smells. Also tracks code complexity, unit test coverage and duplication. Offers branch analysis and C/C++/Objective-C support via commercial licenses. SourceMeter: 2016-12-16 (8.2)
Also note that of the above competitors, including Essbase, all use heterogenous relational (Microsoft SQL Server, Oracle, IBM DB/2, TeraData, Access, etc.) or non-relational data sourcing (Excel, text Files, CSV Files, etc.) to feed the cubes (facts and dimensional data), except for Oracle OLAP which may only use Oracle relational sourcing.