Monday, June 7, 2021

Oracle Academy Midterm Exam Semester 1 Answers


  • Full answers database design - oracle ilearning : 1. The Oracle Database stores data logically in tablespaces, and physically in datafiles associated Choose all correct answers. Flat file database systems pay more attention to retrieving data and...
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  • True or False? It will have a database with transaction details of which student borrows which books. Is a record of one student borrowing one book Data or Information? The first step in system development is to document the requirements. A...
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  • All of the Above. It is important to have them documented as M-M. All ERD's must have at least one Arc. An arc can be modelled as Supertype and Subtypes. People are born in the city and people die in the city. Journalling becomes much easier. Journalling becomes slightly harder. The ability to track data over time. If a system includes the concept of time, and it stores Start Dates, then End Dates becomes Mandatory.
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  • Mekalai Deva For comments or requests, please write us at luchiant gmail. Search Like 9, people like this. Be the first of your friends. Design Group functions ignore null values. True or False? The WITH clause decreases performance. The Oracle server performs a correlated subquery when the subquery references a column from a table referred to in the parent. True Which answer is incorrect? True If a single-row subquery returns a null value and uses the equality comparison operator, what will the outer query return?
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  • No rows Which comparison operator can only be used with a single-row subquery? Which operator can be used with a multiple-row subquery? IN You need to display all the players whose salaries are greater than or equal to John Brown's salary. Which comparison operator should you use? Which two SQL statements correctly use subqueries?
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  • Which statement would you use? Which script should you use? Her new last name is Cooper. Janet is the only person with the last name of Roper that is employed by the company. Her employee ID is still , however, her last name is now Rockefeller. Which SQL statement will allow you to reflect this change? The following SQL statement will execute which of the following?
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  • Which function should you use? The SUBSTR character function returns a portion of a string beginning at a defined character position to a specified length. Which script did you use? Which element would you use? You want the orders with the highest amounts to appear first. Which query should you issue? Single row functions can be nested.
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  • The highest salary in each department. What will the following SQL Statement do? SUM You need to calculate the standard deviation for the cost of products produced in the Birmingham facility. Which group function will you use? AVG You need to compute the total salary for all employees in department Which SQL statement did you execute? Which statement could you use to accomplish this task? The extended cost of each item equals the quantity value multiplied by the cost value. Which SQL statement will display the desired result? You can use subqueries in all of the above clauses. Which of the following is TRUE regarding the order of subquery execution? The subquery executes once before the main query Which statement about subqueries is true? Which operator can be used with subqueries that return only one row? Which of the following constructs would you use? However, you are not sure which supervisor ID belongs to Brad Carter.
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  • No rows would be returned by the outer query. Which of the following statements contains a comparison operator that is used to restrict rows based on a list of values returned from an inner query? All of the above. A multiple-row operator expects how many values? One or more What would happen if you attempted to use a single-row operator with a multiple-row subquery? An error would be returned. Which operator or keyword cannot be used with a multiple-row subquery?
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  • Which multiple-row comparison operator could you use? Which query should you use? The row was created with the correct data in all three columns. If no column list is specified, then the values must be in the order the columns are specified in the table. You need to update the area code of employees that live in Atlanta. All the rows in the table would be deleted. All rows are deleted from the table.
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  • Currently, all employees in department 10 have the same salary value. Which statement should you execute? Which two commands can be used to create new rows? Oracle Answers - by Luchian Teodor. Un produs Blogger. Download pdf.
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  • Section 1 Answer all questions in this section 1. The first step in system development is to document the requirements. Mark for Review 1 Points Wrong. A blueprint for the database design is not needed. We can just start coding straight away. It clarifies what a business wants to accomplish, and provides measures for deciding if the system delivers all that is required.
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  • Making the payment attribute optional. We need to trust our customers, and we know they will pay some day. Hiring a programmer to create additional programming code to verify no goods are shipped until the account has been settled in full. All instances of a subtype may be an instance of the supertype but does not have to. The "Other" subtype is mandatory. You can only create relationships to a Supertype, not to a Subtype. A Supertype can have only one subtype. Relationships can be Redundant. Which of the following pairs of entities is most likely to be modeled as a M:M relationship? Intersection Entities are at the Parent end of the newly created 1:M Parent:Child relationship; therefore, the original entities are the children of the newly created intersection entity.
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  • Intersection Entities often have the relationships participating in the UID, so the relationships are often barred. What do you call the entity created when you resolve a M:M relationship? A non-transferable relationship means the detail can be changed to point to a new master. Refer to Section 5 Lesson 1. Section 6 Answer all questions in this section No, each Entity can only have one UID, the secondary one. Correct A unique identifier must be made up of more than one attribute.
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  • An entity without repeated values is said to be in 1st Normal Form. No commercial database systems in the world will accept tables that are not on 3rd Normal Form. Refer to Section 6 Lesson 3. Mark for Review 1 Points Section 7 Answer all questions in this section Historical data must never be kept. All relationships participating in an arc must be mandatory. Which of the following would best be represented by an arc? Arcs are Mandatory in Data modeling.
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  • All ERD's must have at least one Arc. An arc can also be modeled as Supertype and Subtypes. Which of the following is NOT a relationship type? A particular problem may be solved using either a Recursive Relationship or a Hierarchical Relationship, though not at the same time. Modeling historical data is optional. If a system includes the concept of time and it stores Start Dates, then End Dates becomes Mandatory. Which of the following is a logical constraint that could result from considering how time impacts an example of data storage? End Date must be before the Start Date. Dates must be stored with Time. You are doing a data model for a computer sales company where the price of postage depends upon the day of the week that goods are shipped. So shipping is more expensive if the customer wants Mark for Review 1 Points a delivery to take place on a Saturday or Sunday. What would be the best way to model this?
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  • Use a Delivery Day entity, which holds prices against week days, and ensure the we also have an attribute for the Requested Delivery Day in the Order Entity. Update the prices in the system, print out the current prices when they change, and pin them on the company noticeboard. Allow them to enter whatever delivery charge they want. Correct Section 10 Answer all questions in this section Formal rules do exist for drawing ERD's. Even though they are only guidelines, you should always try to follow them. Which of the following statements are true for ERD's to enhance their readability. By doing so, you end up with more than one ERD that, taken together, documents the entire system.
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  • You must ensure that you have every single entity--even if hundreds of them exist--on one single, big diagram. A datamodel containing generic modeling techniques must not be mixed in with non-generic models. The generic entities MUST be drawn on a diagram of their own. All datamodels must be transformed from specific to generic.
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  • Correct 2. Once you have learned how to write programs and build systems, you no longer need any input or involvement from any users, as you are perfectly capable of delivering the systems the business needs and wants. Mark for Review True. All that perfect systems need are correct programs. Business requirements can and will change. For instance new legal requirements may arise. All users do is delay systems delivery with their forever changing minds and new requirements. Users never know what they want anyway, so building systems are best left to the professionals. Correct The first step in system development is to document the requirements.
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  • Mark for Review 1 Points Wrong. A blueprint for the database design is not needed. We can just start coding straight away. It clarifies what a business wants to accomplish, and provides measures for deciding if the system delivers all that is required. It keeps businesses honest.
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