Relation Schema In subject area: Computer Science A relation schema in the context of computer science refers to the name and attributes of a relation in a database. It represents the structure of the relation,
文心快码 错误消息 "cannot create temporary relation in non-temporary schema" 的含义及解决方法如下: 1. 错误消息含义 该错误消息意味着尝试在一个非临时模式(Schema)中创建了一个临时关系(如表、视图等),但数据库管理系统(DBMS)不允许这样做。在大多数DBMS中,临时关系必须创建在指定的临时模式中。 2. 可能导...
Relation schema − A relation schema describes the relation name (table name), attributes, and their names.Relation key − Each row has one or more attributes, known as relation key, which can identify the row in the relation (table) uniquely....
What is a string in computer science? What does CRAAP stand for in computer science? How does linear algebra relate to computer science? What is schema in computer science? What is a data table in computer science? What are the areas of specialization in computer science?
1. This relational schema models a company schema with departments, employees, and locations. Primary keys are underlined and foreign keys are indicated below each relation. department(dno, dname, mgr List the ordered pairs in the relation R from A={0,1,2,3,4,8...
Inthe3.relationalmodel,akeywordis. A.canbemadeupofmultiplearbitraryattributes B.consistsofatmostoneattribute C.canconsistofoneormoreattributeswhosevalueuniquely identifiesanytupleintherelationalschema NomorethanD. Answer:C 4.inarelation,ifthereissuchanattribute,itsvaluecan ...
As another example, consider a star join where a large fact table is joined with a set of small dimension tables. A star join is a join of tables in a star schema. A star schema includes several dimension tables and a fact table. The fact table includes foreign keys that reference to ...
An optimal architecture of spatiotemporal database management system based on object-relational model is presented in this paper, which extends the kernel of DBMS with spatiotemporal data types and spatiotemporal operations supports. 本文提出了一种基于对象关系模型的优化型时空数据库管理系统体系结构 ,该...