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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.
Explain outer join? Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such ro
Explain five duties of Database Administrator? 1. DBA administers the three stages of the database and, in consultation along with the whole user community, sets up an defin
What is catalog in DBMS? Catalog - A relational DBMS maintains information about every table and index in which it contains. A catalog is a collection of special tables that st
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
What are the various states through which a transaction passes through in its lifetime? Briefly discuss all the events that causes transition from one state to another. Ans:
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
Function requirement as given: 1> manage fans and likes and followings those information from facebook. twitter. google+ and linkedin etc 2> Organize the clients from email m
Natural Join : It is the similar like Equi join except one of the duplicate columns is removed in the result table. The natural join is the most usually used form of join operation
Forward Recovery (Redo): In this system the committed changes made by a transaction are reapplied to a previous copy of the database. In simpler
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