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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.
- Primary key doesn't allow NULLs however unique key allows one NULL.
what are information system hirarchy?
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
Create an index for the table Client, field CLIENT_NO of Q ? Command: CREATE INDEX client_client_no ON client(client_no);
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
Hi is anyone well versed in accounting information systems available now to help me work through an important assignment due tomorrow at noon?
Hashed File Organisation Hashing is the most common form of purely random access to a database or file. It is also used to access columns that do not have an index as an optimi
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In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
What is meant by log-based recovery? The most widely used structures for recording database changes is the log. The log is a sequence of log records, recording all the update a
what is natural join?
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