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How do different schema definition languages support the three level schema?
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How do different schema definition languages support schema architecuret?
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How do different schema definition languages support the three schema architecture?
The three schema approach is used to build informational systems. The schema involves three different levels, which are the physical level, the conceptual level, and the external level.
How many XML Schema languages exist?
Currently, twelve different XML Schema languages exist. All twelve languages are used exclusively in XML Schema, which is a special kind of XML document. XML documents are documents formatted in a way that allows both humans and machines to understand easily.
The types of languages a database system?
Database systems can support multiple types of languages, including data definition language (DDL) for defining database schema, data manipulation language (DML) for querying and updating data, and data control language (DCL) for managing access and permissions. Additionally, some database systems support procedural languages like PL/SQL or T-SQL for writing stored procedures and triggers.
Five main functions of database administrator?
Schema Definition Storage structure and access method definition Schema and physical organization modification. Granting authorization for data access. Routine Maintenance
What is external schema?
The role of the external schema is to support user views of data and thus to provide programmers with easier data access
Why do you need mapping between schema levels?
There is need for mappings between schema levels for visualization and schema matching. The mappings between schema levels helps in the different types of transformation.
What is PDP file extension?
A PDP file is a XSD(Xml schema definition) format file.
What is the foreign plural of schemata?
The foreign plural of "schemata" is "schemata," as it is already plural in English and remains unchanged in other languages.
What is star flake schema?
A starflake schema is a combination of a star schema and a snowflake schema. Starflake schemas are snowflake schemas where only some of the dimension tables have been denormalized. hardkingofflirt@gmail.com
What is xml schema?
XML Schema is an XML-based alternative to DTD.An XML schema describes the structure of an XML document.The XML Schema language is also referred to as XML Schema Definition (XSD).An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntactical constraints imposed by XML itself.
What is schema and sub-schema?
The schema is the physical arrangement of the data as it appears in the DBMS. The subschema is the logical view of the data as it appears to the application program.
