Relationships are shown with a zero or circle representing none, a vertical line representing one, or crow’s foot representing many and can be:
What will be an ideal response?
A. One to one
B. One to many
C. Many to many
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Formulate the following queries using SQL (the answers to these queries in relational algebra, tuple relational calculus, and domain relational calculus were given in the previous section):
relational database contains details about journeys from Paisley to a variety of destinations and contains the following relations: Operator (opCode, opName) Journey (opCode, destinationCode, price) Destination (destinationCode, destinationName, distance) Each operator is assigned a unique code (opCode) and the relation operator records the association between this code and the operator’s name (opName). Each destination has a unique code (destinationCode) and the relation destination records the association between this code and the destination name (destinationName), and the distance of the destination from Paisley. The relation Journey records the price of an adult fare from Paisley to the given destination by as specified operator, several operators may operate over the same route. (a) List the details of journeys less than £100. (b) List the names of all destinations. (c) Find the names of all destinations within 20 miles. (d) List the names of all operators with at least one journey priced at under £5. (e) List the names of all operators and prices of journeys to ‘Ayr’. (f) List the names of all destinations that do not have any operators.
The pseudocode for a recursive method is shown below. What statement is missing from the area labeled (b)?biplane.taxi (target) (a) If ( [biplane.distance to target] > 1 meter) { biplane.point at target biplane.move forward 1 meter (b) } (c)
A. Start B. Do together C. biplane.taxi (target) D. Stop
Using typography effects can make your site more appealing to visitors and improve the readability of the page content.
Answer the following statement true (T) or false (F)
A wireless ______________ is a device that connects via cellular and enables other devices to access the Internet.
Fill in the blank(s) with the appropriate word(s).