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crete a data base relationship model
Entity:
Attributes of students:
Relationship ratios:
Foreign keys
This is the referencing relation of the column i.e. student advisor
Primary keys
They identify the column i.e. the Sname.
Assumptions
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Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
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Using Literal Character String Example: To print IS A as one string with column name employee SELECT ENAME || ' IS A ' || JOB AS "EMPLOYEE" FROM EMP;
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diagrams and meaning
Differentiate between a unique key and a primary key. - By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
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