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Since a user can define a views, logical data independence can achieved by using view definition to hide changes in the conceptual schema.
since the sql user has no knowledge of how the data is physically represented, relying solely on the relation abstraction for querying, physical data independence is also achieved.
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Why do you use Linq over SQL Statements?
The extensibility of the query architecture is used in the LINQ project itself to provide implementations that work over both XML and SQL data. The query operators over XML (LINQ to XML) use an efficient, easy-to-use, in-memory XML facility to provide XPath/XQuery functionality in the host programming language. The query operators over relational data (LINQ to SQL) build on the integration of SQL-based schema definitions into the common language runtime (CLR) type system. This integration provides strong typing over relational data while retaining the expressive power of the relational model and the performance of query evaluation directly in the underlying store.
What is the function of the mitocondria?
Mitochondria provide energy to cells and provide the location for the production of ATP.
Difference between relation and relational schema?
In database design a RELATION is the relationship that you build between two or more tables. As an example lets say you have a Customer table. In this table you have lots of fields FirstName, LastName, Address, City, State, PostalCode, StatusID; etc....... Now StatusID is going to be a numeric value. Lets say that the value is 1 Now you will have a Status Table with multiple fields (ex) StatusID, StatusName, Active, etc..... Now when you display customer information you will not want to show a StatusID as nobody will know what this is. You will want to show the NAME associated with the status. To do this you will create a releationship between StatusID in the Customer table and StatusID in the Status table. In doing so you will provide for faster lookup results, a constraint that does not permit a numeric value in the StatusID field in the customer table that is NOT in the StatusID field of the Status table. THEN... To show correct Results you would write a query something like: SELECT FirstName, LastName, Address, City, State, PostalCode, StatusName FROM Customers as c JOIN Status as s on s.StatusID = c.StatusID A relational Schema is simply a representation of your database highlighting the relationships that you have created throughout.
Can you substitute a 9 x 13 pan for a 2 quart casserole dish?
The answer will depend on the depth of the pan. Since you have not bothered to provide that crucial bit of information, I cannot provide a more useful answer.
What are characteristics of the graph of the linear parent function?
Please don't write "the following" if you don't provide a list.
Explain the difference of internal external and conceptual schemas how are these schema layers related to the concept of logical and physical data independence?
External schemas allows data access to be customized (and authorized) at the level of individual users or groups of users. Conceptual (logical) schemas describes all the data that is actually stored in the database. While there are several views for a given database, there is exactly one conceptual schema to all users. Internal (physical) schemas summarize how the relations described in the conceptual schema are actually stored on disk (or other physical media). External schemas provide logical data independence, while conceptual schemas offer physical data independence.
What technology can you use to provide logical separation and protection between hosts that are on the same physical network?
VLAN
What is High-level nature of hierarchical network and relational database management system?
A Relational Database Management System (RDBMS) is a Database Management System (DBMS) that is based on the relational model as introduced by E. F. Codd. Most popular commercial and open source databases currently in use are based on the relational model.A short definition of an RDBMS may be a DBMS in which data is stored in the form of tables and the relationship among the data is also stored in the form of tables.Network topology is the physical interconnections of the elements (links, nodes, etc.) of a computer network. A local area network (LAN) is one example of a network that exhibits both a physical topology and a logical topology. Any given node in the LAN has one or more links to one or more other nodes in the network and the mapping of these links and nodes in a graph results in a geometrical shape that may be used to describe the physical topology of the network. Likewise, the mapping of the data flows between the nodes in the network determines the logical topology of the network. The physical and logical topologies may or may not be identical in any particular network.Hope this helps!Inclus - We provide individual and corporate training(Inclus.net)Educate, Learn & Serve
What is raid volume?
A logical representation of one or more physical disks configured to provide redundant and/or large storage space for the system.
What is the importance of relational database?
Relational databases provide a structured way to store and organize data, making it easier to query and retrieve information. They ensure data integrity through relationships between tables, enabling efficient data management and analysis. Relational databases also support transactions and ACID properties, ensuring data remains consistent and reliable.
What represents a logical conclusion based on the two propostions below?
It is difficult to determine a logical conclusion without knowing the propositions. Please provide the propositions so that a logical conclusion can be derived.
Did the declaration of independence provide separation of powers?
No. It just told why the colonies wanted independence.
Brief in What is the Difference between physical DFD and logical DFD?
A logical DFD makes it easier to communicate for the employees of an organization, leads to more stable systems, allows for better understanding of the system by analysts, is flexible and easy to maintain, and allows the user to remove redundancies easily. On the other hand, a physical DFD is clear on division between manual and automated processes, gives detailed description of processes, identifies temporary data stores, and adds more controls to make the system more efficient and simple. simply put… 1. Logical DFDs are not concerned about how the system is or will be constructed while Physical DFDs show how the system is or will be constructed. 2. Physical DFDs are more realistic and complex while Logical DFDs are simpler but provide an easier understanding view
What is the primary added value of relational databases over flat files?
Relational databases provide structured data storage that allows for efficient querying using SQL, data integrity through relationships between tables, and scalability to handle large amounts of data. Flat files lack these capabilities, making relational databases a more robust and organized solution for managing data.
What is relational calculus?
Tuple calculus was created by Edgar F. Codd to provide a database-query language. It typically consists of two calculi and domain.
Which logical fallacy appears in this passage?
I'm happy to help identify a logical fallacy if you provide the passage for me to review.
What is uni logical social work?
"Uni logical social work" does not appear to be a commonly recognized term or concept in the field of social work. It may be a typo or a mistaken phrase. If you can provide more context or clarify the term, I can try to provide a better answer.
