Explanation:
Both Primary Key and Candidate Key are the attributes that are used to access tuples from a table. These (Primary key and Candidate key) are also can be used to create a relationship between two tables.
- A Candidate Key can be any column or a combination of columns that can qualify as a unique key in the database. Each Candidate Key can qualify as a Primary Key.
- A Primary Key is a column or a combination of columns that uniquely identify a record. The primary key is a minimal super key, so there is one and only one primary key in any relationship.
<em> The main difference between them is that a primary key is unique but there can be many candidate keys. </em>
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Answer:
See in Explanation
Explanation:
All you know is that an 
algorithm is eventually (a lot) faster than an 
algorithm, but for any specific value of n, you can't say anything. Indeed, the asymptotic growth of the function doesn't depend on its value on 
. This means that if 
then for all 
, the following function is also :
So asymptotic notation is completely uninformative regarding the performance of algorithms on specific values of n.
You could say that functions such as 
are artificial and never really occur in practice. This is not quite true (you can hard-code some auxiliary information for small n, for example), but even if you consider "natural" functions, asymptotic notation doesn't help you to determine anything other than asymptotic's: consider for example 
against 
(such examples definitely happen in practice, for example in fast matrix multiplication).
The security IT administrator he or she is planning to install smart card communications over the network which is can be access through TCP IP address.
Smart card key reader to be placed or installed where is required such as an opening door or entrance of office or organization extra.
Key card readers should be contactless and record more volume of data and it should synchized with the system at regular intervals.
By Installing smart card and it readers unauthorized person entry to lab or network server can be avoided. Since smart card reader connected to the network, IT SECURITY administrator can generate log reports.
It means the operating system used in enterprise.
When a corporation needs 100 computers to have OS, it has to order enterprise OS packages from M$.
