Practice question! Will upvote best answer. Thank you. The primary key of a relation may have...
Practice question! Will upvote best answer. Thank you.
The primary key of a relation may have more than one attribute. However, a foreign key of a relation must have only one attribute. Is this true or false?
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Practice question! Will upvote best answer. Thank you.
The primary key of a relation may have...
The employee is table, the best candidate for primary key is Select one: a. Department ID...
The employee is table, the best candidate for primary key is Select one: a. Department ID b. Employee hiredate c. Employee ID d. Employee salary Question 2 A primary key can be composed of more than one attribute. Select one: True False Question 3 A foreign key allows you to join two tables. Select one: True False Question 4 Given two tables, department (dept_id, dept_location, dept_name) and EMPLOYEE(emp_id, emp_name, emp_dept_id, emp_name, emp_salary), which attribute (column) is the foreign key? Select...
TRUE OR FALSE Question 9. A relation can only have one primary key 10. Durability in transaction managemens relers t ao die run as if there are no other concurrent srasactions 9. A relation can...
TRUE OR FALSE Question
9. A relation can only have one primary key 10. Durability in transaction managemens relers t ao die run as if there are no other concurrent srasactions
9. A relation can only have one primary key 10. Durability in transaction managemens relers t ao die run as if there are no other concurrent srasactions
QUESTION 1 What is the most common relationship within a relational database? Select the best answer...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
Database Questions (Please help if you can) For the same query task, different DBMSs may use...
Database Questions (Please help if you can) For the same query task, different DBMSs may use different SQL statements. true (b) false Given a table, any column of this table can be used as a key of the table. true (b) false It is allowed to have multiple keys in a table. true (b) false When we create a table in a DBMS, if we do not explicitly specify the database, the table can never be created the DBMS does...
BONUS QUESTION: Suppose you have two tables, EMPLOYEES with primary key employee_ID, and DEPARTMENTS with primary...
BONUS QUESTION: Suppose you have two tables, EMPLOYEES with primary key employee_ID, and DEPARTMENTS with primary key department_ID. Assume each department may have many employees, but each employee is only assigned one department. What would be the correct SQL syntax for retrieving data from both tables? (HINT: You must find out what is the foreign key) A. SELECT employee_ID, employee_name, department_ID, department_location FROM Employees JOIN Departments ON Employees.employee_ID = Departments.employee_ID; B. SELECT employee_ID, employee_name, department_ID, department_location FROM Employees JOIN Departments...
Given the relation below (note that there is a composite primary key in this relation): (Prescrip...
Given the relation below (note that there is a composite primary key in this relation): (PrescriptionNumber, PatientID, Date, Drug, Dosage, PrescriberID, PrescriberName, PatientName) Depending on your assumption for the relation (for example, assume that the value of PrescriberID can uniquely determine the value of PrescriberName), Is this relation in at least 3rd normal form? Explain your reasoning. If your answer to the 2nd question is ‘No,’ normalize this relation to 3rd normal form (or above). Write down the final relation(s)...
QUESTION 6 Which of the following statements best illustrates the "Key" constraint? The schema MUST be...
QUESTION 6 Which of the following statements best illustrates the "Key" constraint? The schema MUST be created before tables are added A primary key MUST NOT have duplicate values A foreign key value MUST have a value already present as a primary key in another table (or be NULL) A primary key value MUST have a value QUESTION 7 Which of the following statements best illustrates the "Referential Integrity" constraint? The schema MUST be created before tables are added A...
Question 34 (1 point) A default value is a value a field will assume unless an...
Question 34 (1 point) A default value is a value a field will assume unless an explicit value is entered for that field. True False Question 35 (1 point) A relation is said to be in second normal form if the primary key consists of only one attribute. True False Question 36 (1 point) The result of nor primary key and nothing but the primary key. malization is that every nonprimary key attribute depends upon the whole True False Question...
24) A key that contains more than one attribute is called a(n) A) composite key B)...
24) A key that contains more than one attribute is called a(n) A) composite key B) complex key C) multi-key D) n-key E) candidate key 25) Null values can cause problems because they are ambiguous. True False 26) In the normalization process, it is necessary to identify all the determinants in a relation. True False 27) To represent a relationship in the relational model, the primary key of one relation is placed into a second relation. True False 28) A...
Please answer true or false 27) Relationship instances occur when an instance of one entity is...
Please answer true or false 27) Relationship instances occur when an instance of one entity is related to an instance of another entity via a relationship. 28) Two columns of a relational table can have the same values. 29) If one of two identical relational tables has the first row moved to the last place, those two relational tables are no longer identical. 30) An entity and its 1:1 unary relationship are mapped as one relation. 31) An entity and...
TRUE OR FALSE Question
9. A relation can only have one primary key 10. Durability in transaction managemens relers t ao die run as if there are no other concurrent srasactions
9. A relation can only have one primary key 10. Durability in transaction managemens relers t ao die run as if there are no other concurrent srasactions
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
QUESTION 6 Which of the following statements best illustrates the "Key" constraint? The schema MUST be created before tables are added A primary key MUST NOT have duplicate values A foreign key value MUST have a value already present as a primary key in another table (or be NULL) A primary key value MUST have a value QUESTION 7 Which of the following statements best illustrates the "Referential Integrity" constraint? The schema MUST be created before tables are added A...
Question 34 (1 point) A default value is a value a field will assume unless an explicit value is entered for that field. True False Question 35 (1 point) A relation is said to be in second normal form if the primary key consists of only one attribute. True False Question 36 (1 point) The result of nor primary key and nothing but the primary key. malization is that every nonprimary key attribute depends upon the whole True False Question...
24) A key that contains more than one attribute is called a(n) A) composite key B) complex key C) multi-key D) n-key E) candidate key 25) Null values can cause problems because they are ambiguous. True False 26) In the normalization process, it is necessary to identify all the determinants in a relation. True False 27) To represent a relationship in the relational model, the primary key of one relation is placed into a second relation. True False 28) A...
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