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Exercises StructuredQueryLanguage
SQL was one of the first commercial languages for Edgar F. Codd's relational model, as described in his influential 1970 paper, "A Relational Model of Data for Large Shared Data Banks".[5] Despite not adhering to the relational model as described by Codd, it became the most widely used database language.[6][7] Although SQL is often described as, and to a great extent is, a declarative language, it also includes procedural elements. SQL became...
15 p dtu 23/10/2012 202 1
Từ khóa: Exercises StructuredQueryLanguage, SQL Server, ngôn ngữ SQL, kỹ thuật dữ liệu, kỹ thuật máy tính, phần mềm máy tính
The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by Edgar F. Codd.In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database. The purpose of the relational model is to provide a declarative method for specifying data and...
12 p dtu 23/10/2012 198 1
Từ khóa: Exercises Relational Model, SQL Server, ngôn ngữ SQL, kỹ thuật máy tính, phần mềm máy tính, kỹ năng dữ liệu
Exercises data modeling and entity relationship model
In software engineering, an Entity – Relationship model (ER model for short) is an abstract way to describe a database. It usually starts with a relational database, which stores data in tables. Some of the data in these tables point to data in other tables - for instance, your entry in the database could point to several entries for each of the phone numbers that are yours. The ER model would say that you are an entity, and each phone...
17 p dtu 23/10/2012 194 1
Từ khóa: Entity–relationship model, Exercises data modeling and entity relationship model, SQL Server, kỹ thuật dữ liệu, kỹ thuật máy tính, phần mềm máy tính
SQL was one of the first commercial languages for Edgar F. Codd's relational model, as described in his influential 1970 paper, "A Relational Model of Data for Large Shared Data Banks". Despite not adhering to the relational model as described by Codd, it became the most widely used database language.Although SQL is often described as, and to a great extent is, a declarative language, it also includes procedural elements. SQL became a standard...
11 p dtu 23/10/2012 218 2
Từ khóa: Exercises SQL Server, language SQL Server, kỹ thuật máy tính, phần mềm máy tính, kỹ thuật dữ liệu, máy tính ứng dụng