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The study of databases for business professionals is an important aspect as it allows them to categorize large sums of data into a simple outline or sheets. Such simplification makes it easy to monitor new upcoming needs and serve a huge number of people at a specific time. It also makes aspects such as communication easy as all the communication info that appears is safely kept on the database. Databases are also the basis for making decisions in an organization as they guide the professionals on the product trends of their customers.
Referential integrity constraint is a concept applied in relational databases with the aim of ensuring consistency on columns and rows. It may be defines as a similar association of two or more entities. A good example of the concept is when a reference of a book adopts two entities, the information about the author of the book and the publisher info.
SQL statement; first_name,last_name,phone_number from customer where boat_length>=32 0rder by last_name,first_name
SQL statement; Select boat_name from customer order by size desc
SQL statement; select boat_length from customer group by boat_length
SQL statement; select model from customer where town=marina group by model
SQL statement; select customer_id from customer where state=’Washington’