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I need help in key topic of relational Databases?
Hi... Can u please explain me the following keys with an example..,
Primary key,
Unique key,
surrogate key,
foreign key,
super key,
candidate key.
primary key is a unique like ssn its different for each entry
foreign key is like an attribute of one relation appearing again in another relation like in one relation I have registration no and car model in another relation i have car name ,car model and color then u can see that car model attribute is common to both relations hence it is a foreign key to the second table ..u cannot have a foreign key unless it has appeared before in another relation ! this is how i understand it ..also if registration no comes in 2 tables then sure reg no is both primary and foreign key .
super key is like 2 attributes that can identify a row suppose we have 2 values repeated we can't identify which row we are referring to in the table so we need another attribute(s) to identify the row
we can even identify a row by listing all the attributes ! the whole set then becomes a super key
the minimum superkey set is called candidate key
if I have employee table having attributes employee ID,employeejobs.salary etc ..a single employee may have 2 jobs in a single office like in our college the Hod is both the HOD of IT dept. and a teacher so his employee id will be repeated we need more attributes to identify the tuple now! so the minimum such set is called candidate key and super key is all attributes of the combination of the sets of attributes (coloumns) with which u can identify a tuple (row)
A unique key must uniquely identify all possible rows that exist in a table and not only the currently existing rows.eg ssn ..the primary key is a set of columns that identify only one row but unique keys identify more than one row also NOT NULL is not applicable to unique keys but is applicable to primary key..a unique Key Set must have atleast one primary key in it ..yes a unique key is also a superkey
i do not know of surrogate key sorry
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