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Explain outer join?
Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such rows could be forcefully selected through using the outer join. The corresponding columns for in which row will have NULLs. There are actually three forms of the outer-join operation: left outer join ( X), right outer join (X ) and full outer join ( X ).
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
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what is primary key
An entity set that does not have sufficient attributes to form a primary key is called? An entity set that doesn't have sufficient attribute to form a primary key is known as w
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What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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