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Describe the types of attributes?
Types of attributes: An attribute's category determines the type of values that are permitted in the attribute. For instance, the value version 1 is not valid for an attribute described as an integer, but the value 1 is valid. Numeric types (such as integer or real) can also be limited to a predefined range through their attribute definition.
Choice : An attribute along with a list of predefined values.
ID Reference: An attribute along with a value which is a Unique ID value from another element. It is typically used for element-based cross-references.
ID References: An attribute along with a value of one or more Unique ID values from another part.
Integer: An attribute along with a whole number value (no decimal parts). Examples of valid integers are 22, -22, and +322. An integer could be described to fall within a range.
Integers: An attribute along with a value of one or more integers. Enter each number on a separate line within the Attribute Value text box. Real An attribute along with a real number value, with or without a decimal part (the value could also be expressed within scientific notation). Examples of valid real numbers are 2, 22.4, -1 0.22, and 2.3e. A real number could be described to fall inside a range.
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
You are to write a property management database program that allows a real estate agent to view, add, search, and save property listings. The program is to do the following: 1.
A database administrator''s responsibilities and data contents
Explain algorithm of ER To Relational Mapping ? ER-to-Relational Mapping Algorithm: 1) Step 1: Mapping of regular entity types: For each strong entity type E, form a relatio
What are the reasons of bucket overflow? Explain any two methods for solving this problem. Ans: It is general for file structures to be divided into equal-length partitions, k
Determine the rule that a value of a foreign key should appear as a value of some particular table is called a Ans: Referential constraint. The rule that a value of a fo
What is meant by data-transfer rate? The data-transfer rate is the rate at which data can be retrieved from or kept to the disk.
ALTER TABLE Command : This command is used for variation of existing structure of the table in the given situation: When a new column is to be added to the table structure.
What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
Emergence of Client Server Architecture Some of the pioneering work that was completed by some of the relational database vendors permitted the computing to be distributed on m
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