When.com Web Search

Search results

1. Results From The WOW.Com Content Network

2. Information schema - Wikipedia

   en.wikipedia.org/wiki/Information_schema

   In relational databases, the information schema (information_schema) is an ANSI-standard set of read-only views that provide information about all of the tables, views, columns, and procedures in a database. [1]

3. File:Programmation SQL-fr.pdf - Wikipedia

   en.wikipedia.org/wiki/File:Programmation_SQL-fr.pdf

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

4. Database schema - Wikipedia

   en.wikipedia.org/wiki/Database_schema

   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 formal definition of a database schema is a set of formulas (sentences) called integrity constraints imposed on a database.

5. Query language - Wikipedia

   en.wikipedia.org/wiki/Query_language

   Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. The difference is that a database query language attempts to give factual answers to factual questions, while an information retrieval query language attempts to find documents containing information that is relevant to an area of inquiry.

6. Relational model - Wikipedia

   en.wikipedia.org/wiki/Relational_model

   A table in a SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles. [3]

7. Query by Example - Wikipedia

   en.wikipedia.org/wiki/Query_by_Example

   Query by Example (QBE) is a database query language for relational databases. It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL. [1] It is the first graphical query language, using visual tables where the user would enter commands, example elements and conditions.