List the reasons why an index is only helpful for attributes that have a wide range of values.
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Q: Explain why an index is only useful if an attribute's values change enough.
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Q: In order to utilize an index, an attribute's values must be sufficiently varied.
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List the reasons why an index is only helpful for attributes that have a wide range of values.
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- What factors influence the decision to createan index on a field?Chevening Scholarship Database's stores data about each application received by the Chevening Foundation. As a database designer, you're assigned to design the new database system according to the following requirements: Each applicant can submit one or more applications (one application per year). Each application form is submitted by only one applicant. Each application has a unique application ID number, application date, class level, GPA, GPA scale, academic honours, extracurricular activities, community activities, other scholarship awarded and financial need. The applicant's record contains student ID, student's last name, first name, date of birth, address, city, state, zip code, phone number and email address. Each school can be associated with one or more applications. Each application is associated with only one school. Each school has a unique school ID, school name, type, address, city, zip code and phone number. Each application must include two or more recommendations.…The value range of an attribute must be large enough for the index to be relevant. Except for this one use case, an index is never helpful.
- Why are field values sometimes coded?Explain why an index is only helpful if the values of an attribute have a suitable range of values.Database Foundations: Design a database to produce the following reports. Do not use any surrogate keys in your design. For each guide, list the guide number, guide last name, guide first name, address, city, state, postal code, telephone number, and date hired. For each trip, list the trip ID number, the trip name, the location from which the trip starts, the state in which the trip originates, the trip distance, the maximum group size, the type of trip (hiking, biking, or paddling), the season in which the trip occurs, and the guide number, first name, and last name of each guide. A guide may lead many trips and a trip may be led by many different guides. For each client, list the client number, client last name, client first name, address, city, state, postal code, and telephone number
- When dealing with missing field values in a database, what are the threeExplain why an index is only helpful if the values of an attribute vary enough.SQL A database used in an order-entry system is to contain information about customers, items, and orders. The following information is to be included. – For each customer: Customer number (unique) Valid “ship to” addresses (several per customer) Balance Credit limit Discount – For each order: Heading information: customer number, “ship-to” address, date of order. Detail lines (several per order), each giving item number, quantity ordered – For each item: Item number (unique) Warehouses Quantity on hand at each warehouse Item description For internal processing reasons, a “quantity outstanding” value is associated with each detail line of each order. [This value is initially set equal to the quantity of the item ordered and is progressively reduced to zero as partial shipments are made.] Design a database for this data.
- SQL Database Design Why it is important to have a primary key column within a database table?SQL Help This veterinarian hospital wants to set up a data warehouse containing various information about the business. One section of this data warehouse should focus on recording information related to each pet visit to the hospital.For each of the visit, it is essential to record the various information represented in the previous tables about the pet, owner and treatment.It is also essential to record data about the date of the visit, including the day, month and year. Finally, the visit fee should be recorded. Note that there is no flat fee for each treatment as the treatment cost can vary depending on the pet type.Based on all these information, draw a star schema for this specific part of data warehouse focusing on recording data related to each visit.Alternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users. These indexes would be considered Alternate or Secondary keys and are mostly used for queries and quick reporting. They may contain multiple columns.
