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Define Partial Key and Primary Key
A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar owner entity. Primary key is a unique key but not comprise null values. An entity set can comprise at most one primary key.
#question. acompani datdbase needs to store information about employees (identified by a social security number,with salary and phone as attributes) and departments (identified by
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What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
Describe the shadow paging technique.
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Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
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