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CCL is patterned after the Structured Query Language (SQL). All Cerner Millennium health information technology software uses CCL/Discern Explorer to select from, insert into, update into and delete from a Cerner Millennium database and allows a programmer to fetch data from an Oracle database and display it as the user wants to see. With ...
The following table shows the usage of the query language in the context of an access control matrix. The first query means that all managers working for the company for more than six months can read the financial report, as well as the managers who are classified by the flag "ReadFinancialReport".
The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS). The term "schema" refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases).
The following tables compare general and technical information for a number of available database administration tools. Please see individual product articles for further information. This article is neither all-inclusive nor necessarily up to date. Systems listed on a light purple background are no longer in active development.
The names of tables and columns in many Oracle production databases in use today are due to the use of Oracle Designer. Later versions of the tool allowed specification of most of the internals of the Oracle database such as tablespaces and files. Database Definition Language (DDL) generation from the Database design. Function model.
In other databases, alternatives to express the same query (other queries that return the same results) can be tried. Some query tools can generate embedded hints in the query, for use by the optimizer. Some databases - like Oracle - provide a plan table for query tuning. This plan table will return the cost and time for executing a query.
The terms data dictionary and data repository indicate a more general software utility than a catalogue. A catalogue is closely coupled with the DBMS software. It provides the information stored in it to the user and the DBA, but it is mainly accessed by the various software modules of the DBMS itself, such as DDL and DML compilers, the query optimiser, the transaction processor, report ...
Such structure type can be then used to create a table that would also hold all columns defined in Person_Type: CREATE TABLE Person_Table OF Person_Type ; Custom structure types support inheritance, which means that one can create another type that inherits from previous.