Options: Indexes are created to enforce uniqueness on columns., Indexes are created to enable fast retrieval by column values., Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes., Indexes are created with the ALTER TABLE command.
Options: an error-detecting code based on a summation operation performed on the bits to be checked, a check bit appended to an array of binary digits to make the sum of all the binary digits., a code in which each expression conforms to specify rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the error is detected., the ratio of the data units in error to the total number of data units
Options: A class that has direct instances, but whose descendants may have direct instances., A class that has no direct instances, but whose descendants may have direct instances., A class that has direct instances, but whose descendants may not have direct instances., A class that has no direct instances, but whose descendants may not have direct instances
Options: a. You can find deleted files in recycle bin
b. You can restore any files in recycle bin if you ever need
c. You can increase free spaceof disk by sending files in recycle bin
d. You can right click and choose Empty Recycle Bin to clean it at once
You have just installed a new internal PCI modem on you desktop. It will not dial out. what is the problem?
Options: The port speed is set too high, the modem has not been set up in control panel properties, the phone line is plugged into the line-in port on the modem card, the phone line out of the wall is plugged into the phone port on the modem card
. Which of the following is a correct order of precedence in a formula calculation?
Options: a. Multiplication and division, exponential positive and negative value b. Multiplication and division, positive and negative values, addition and subtraction c. Addition and subtraction, positive and negative values, exponentiation d. None of above
How does a host on an Ethernet LAN know when to transmit after a collision has occurred? In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting. You can improve the CSMA/CD network by adding more hubs. After a collision, the station that detected the collision has first priority to resend the lost data. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
. You created a query with two tables that have relationship of One-To-Many with referential rules applied. The first table has 3 records and the second has 8. With using a right outer join, how many records will the resulting recordset have?
Options: a. 5
d. Not enough information to tell