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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.
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Draw an ER diagram that represents the information described below. Show all entity sets, relationship sets, primary keys, and the mapping cardinality of the relationship sets.
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An employee record has the following structure struct employee { int eno; char name[22]; float salary; char dept[10];}; (i) Calculate the record size R in bytes.
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