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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.
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
Relational Model: The relational model uses a collection of tables to represent both data and the relationships among those data. Each table has multiple columns and each column h
Horizontal Fragmentation- Horizontal fragmentation groups together the tuples in a relation that are collectively used by the main transactions. A horizontal fragment is produced b
assume we have the following apllicationthat model sccer team the games they play and the players inv each teamin the design we want to capture
Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
What are the states of transaction? The states of transaction are:- a) Active b) Partially committed c) Failed d) Aborted e )Committed f) Terminated
Data independence seems that "the application is independent of the access strategy and storage structure of data". In other words, the ability to change the schema definition in o
how the string works as keyword?
What are called jukebox systems? Jukebox systems have a few drives and numerous disks that can be loaded into single of the drives automatically.
What is database Trigger? A database trigger is a PL/SQL block that can explained to automatically execute for insert, update, and delete statements against a table. The trigge
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