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Key attributes are specific attributes in a database that uniquely identify a record within a table, often represented as primary keys. Domain attributes, on the other hand, refer to the defined set of values that a particular attribute can take, such as the range of valid entries for a field like age or the possible values for a status field. Together, they ensure data integrity and help enforce constraints within a database.
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Define domain with respect to dbms?
In database technology, domain refers to the description of an attribute's allowed values. The physical description is a set of values the attribute can have, and the semantic, or logical, description is the meaning of the attribute.
Why attribute text can not be displayed in attribute block while using GstarCAD?
The main reason is system variable "attmode" value is 0. Input "attmode" in command line then change the parameter from 0 to 1. The function of system variable "attmode": Turn the display of attributes on or off (visible or invisible), or maintains their active assigned state. Range: 0 (All attributes invisible), 1 (Normal-based on setting as defined for the individual attribute), 2 (All attributes visible) Default: 1
What two attributes must be contained in the composite entity between store and product?
Primary key of both parent attributes
What is the super key in database management system?
the super key is the windows key (the flag) in non-windows OS
Is it possible for the computer to generate values that are used as the primary key column?
Yes. Often times, an automatically generated key column will be a normal primary key using the auto_increment attribute.
What is key attribute and non key attributes?
A key attribute is an attribute that uniquely identifies a record in a database table. Non-key attributes are attributes that are not used to uniquely identify records, but provide additional information about the data.
What are key attribute and non key attribute?
Attributes can be classified as identifiers or descriptors. Identifiers, more commonly called keys or key attributes uniquely identify an instance of an entity. If such an attribute doesn't exist naturally, a new attribute is defined for that purpose, for example an ID number or code. A descriptor describes a non-unique characteristic of an entity instance. An entity usually has an attribute whose values are distinct for each individual entity. This attribute uniquely identifies the individual entity. Such an attribute is called a key attribute. For example, in the Employee entity type, EmpNo is the key attribute since no two employees can have same employee number. Similarly, for Product entity type, ProdId is the key attribute. There may be a case when one single attribute is not sufficient to identify entities. Then a combination of attributes can solve this purpose. We can form a group of more than one attribute and use this combination as a key attribute. That is known as a composite key attribute. When identifying attributes of entities, identifying key attribute is very important.
What is a non key attribute in normalization?
An attribute is another name for a field in a table. Some attributes are used as keys to help specifically identify individual records,like a code number or reference number for example. Most attributes are not used as keys. Any of those are non-key attributes.
What ievery determinant is candidate key?
A candidate key is a minimal set of attributes in a relational database that can uniquely identify a tuple (row) in a table. Every determinant, which is an attribute or a set of attributes that can determine another attribute, can be a candidate key if it uniquely identifies all other attributes in the relation and is minimal. This means that if any attribute is removed from the determinant, it no longer uniquely identifies the tuples. In essence, every candidate key is a determinant, but not all determinants qualify as candidate keys.
What is key attribute and entity in database?
The attribute (or combination of attributes) that is unique for every entity instance e.g.: the account number of an account, the employee id of an employee etc.
What is the difference between attribute and domain?
An attribute is a characteristic or property of an entity in a database, representing a specific piece of data, such as a person's name or age. A domain, on the other hand, defines the set of permissible values that an attribute can take, essentially establishing the constraints on the data type and range. For example, an attribute might be "age," while its domain could specify that valid values are integers between 0 and 120. Thus, attributes describe the data, while domains constrain the data.
What are the requirements for a relation to be in Second Normal Form?
A relation is in second normal form (2NF) if any of the following conditions apply: The primary key consists of only one attribute No non-primary key attribute exists in the relation Every non-primary key attribute is functionally dependent on the full set of primary key attributes
Define domain with respect to dbms?
In database technology, domain refers to the description of an attribute's allowed values. The physical description is a set of values the attribute can have, and the semantic, or logical, description is the meaning of the attribute.
Can you sort a table without a primary key?
Yes. You can sort on any attribute or combination of attributes in a table (in SQL using the "order by" clause). Of course the sort is only as good as the "uniqueness" of the attribute you sort on, hence a combination of attributes may be helpful. A primary key is, by definition, unique across all rows in the table.
What is the prime attribute in DBMS?
prime attributes are the attributes of a candidate key which will give uniqueness. a candidate key is (the subset of superkey) which gives uniqueness. Super key is the maximum set of attributes that can provide uniqueness example ABCDE is a super key AB CD DE are the candidate keys s.t. AB is the primary key. CD and DE are the secondary/alternate keys.
What is Foreign key plus attribute is know as?
A foreign key combined with attributes is known as a "composite key" when it includes more than one attribute. However, if the foreign key itself is being described in relation to its attributes, it typically refers to the relationship between tables where the foreign key in one table points to the primary key of another table, establishing a link between the two. This linkage helps maintain referential integrity within the database.
What part of speech is attributes?
Attributes is a noun (plural form of attribute) and a verb (third person singular conjugation of attribute).
