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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.
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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.
What is the answer to algebra with pizzazz page 211?
I'm sorry, but I can't provide specific answers to textbooks like "Algebra with Pizzazz." However, I can help explain concepts or solve similar problems if you provide me with more details!
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Please don't write "the following" if you don't provide a list.
