How is a composite key different than a single key? a) It can be referenced by a forign key b) It cannot contain null values c) It is made of multiple columns c) It contains only unique values
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How is a composite key different than a single key?
a) It can be referenced by a forign key
b) It cannot contain null values
c) It is made of multiple columns
c) It contains only unique values
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- True or False: Referential integrity constraints ensure the values of a primary key are valid based on the values in a foreign key.If we implement a queue using an array where we treat the array as if its two ends are "taped together", we call that a linear array. O True FalseIs it possible to control the integrity of a field by selecting a certain data type?
- J SHORTAND NOTATION FOR RELATIONAL SQL TABLES Notation Example Meaning Underlined A or A, B The attribute(s) is (are) a primary key Superscript name of relation AR or AR, BR The attribute(s) is (are) a foreign key referencing relation R As an example, the schema R(A, B, C, D, ES) S(F, G, H) corresponds to the following SQL tables: CREATE TABLE R ( A <any SQL type>, B <any SQL type>, C <any SQL type>, D <any SQL type>, E <any SQL type>, PRIMARY KEY(A), FOREIGN KEY (E) REFERENCES S(F) ); CREATE TABLE S ( F <any SQL type>, G <any SQL type>, H <any SQL type>, PRIMARY KEY(F)) EXERCISE Consider the following relational schema, representing five relations describing shopping transactions and information about credit cards generating them [the used notation is explained above]. SHOPPINGTRANSACTION (TransId, Date, Amount, Currency, ExchangeRate, CardNbrCREDITCARD, StoreIdSTORE) CREDITCARD (CardNbr, CardTypeCARDTYPE, CardOwnerOWNER, ExpDate, Limit)…relation: Book (BookID, Author, ISBN, Title) Write a PL/SQL block of code that performs the following tasks: Read a Book id provided by user at run time and store it in a variable. Fetch the Author and title of the book having the entered id and store them inside two variables Display the fetched book author and title.22. The primary key is selected from the: a. composite keys b. determinants c. candidate keys d. foreign keys
- Write Mysql code The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key Write a SELECT statement to create a lesson schedule with the lesson date/time, horse ID, and the student's first and last names. Order the results in ascending order by lesson date/time, then by horse ID. Unassigned lesson times (student ID is NULL) should not appear in the schedule. Hint: Perform a join on the Student and LessonSchedule tables, matching the student IDs.Primary keys and candidate keys may both be assigned to the same attribute.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. Books Authors Bookstore Members Sales transaction table Inventory table
- Until a file signature analysis is run, EnCase relies on the ______ to determine its file type. header extension database acquisition hash libraryWhat is the purpose of a primary key?Population Database You will find a program named CreateCityDB.java in Starting Out with Java: Early Objects (6th Edition) Chapter 15 Source Code. Compile and run the program (SEE BELOW). The program will create a Java DB database named CityDB. The CityDB database will have a table named City, with the following columns: Column Name Data Type CityName CHAR (50) Primary Key Population DOUBLE The CityName column stores the name of a city, and the Population column stores the population of that city. After you run the CreateCityDB.java program, the City table will contain 20 rows with various cities and their populations. Next, write a JavaFX application called PopulationDemo that connects to the CityDB database and allows the user to click any of the following operations: Sort the list of cities by population, in ascending order. Sort the list of cities by population, in descending order. Sort the list of cities by name. Get the total population of all the cities. Get the…
