Database Design ##

 Table 1. The relationship between the multiple
     1-one:
     2-to-many (many)
      such as: employee and department staff but a sector corresponding to a plurality of values corresponding to a sector employee
     3-many:
            The : students and curriculum
 2. To achieve the relationship:
        1-to-many (many)
                  ways: the establishment of a foreign key in a multi-party, pointing to a party primary key

 

 

 

 

 

 

     

 

 

          2. to-many

 

 

                     Implementation: need the help of a third middle of the table.
                                     Intermediate table comprising at least two fields, the two fields third table as a foreign key, the two tables point to the primary key
       
                      NOTE: use a "primary key"

 

 

 

 

 

         3. One to One

                   Ways: You can add 'unique' foreign key to the other in either one of the primary key.

 

 

 

 

  
  
 2. Fan test database
 backup and restore 5. Database