____________________ means that one person's work serves as a complementary check on another person's actions.
Fill in the blank(s) with the appropriate word(s).
Separation of duties
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Showthat the semi-join operation is not commutative, that is, T1 semi-joined with T2 is not the same as T2 semi-joined with T1.
What will be an ideal response?
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.
A backslash (\) through a slide number means that the slide _____.?
A. ?has been deleted B. ?has narration timings C. ?is hidden D. ?has hyperlinks
Case WDX 5-1Brad works in the Human Resources department of a large corporation. His supervisor asked him to create a form for new employees to complete during orientation. Brad wants to link the form to an Access database so that he can compile the data. What is the first step he should take?
A. Follow the steps in the Link Text Wizard B. In Access, click the Link to the data source by creating a linked table option C. Save form data as a delimited text file D. Open a new blank database in Access