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What is inheritance? Define it in detail?
Inheritance
Inheritance can be at the levels of types, or at the level of tables we first consider inheritance of types, then inheritance at the level of labels.
Type inheritance
Assume that we have the following type definition for people
create type person
(name varchar(20)
address varchar(20))
Table inheritance
Create table people of person
The consistency requirements for sub tables are
1. Each tuple of the sub table can correspond to at most single tuple in each of its immediate sub tables.
2. SQL:1999 has an additional constraint that all the tuples corresponding to each other must be derived from single tuple .
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
why we fregment at all?
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Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
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