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For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key attribute in S. Any easy attributes of the m:n relationship type (or easy components of a composite attribute) is also contain as attributes of S.
For example, the m: n relationship taught-by among entities COURSE and FACULTY should be shown as a new table. The structure of the table will contain primary key of COURSE and primary key of FACULTY entities
A new table TAUGHT-BY will be created as: Primary key of TAUGHT-By table
ID
Course_ID
{Primary key of FACULTY table}
{Primary key of COURSE table}
Please note that since there are no attributes to this relationship, thus no other fields.
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
lock and types of lock
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