________ starts your computer with a minimal set of drivers so that you can start your computer when problems with drivers or other software are preventing normal startup
a. Safe Mode
b. Recovery Mode
c. Last Known Good
d. None of the above
A. Safe Mode is useful if your computer has stopped responding or is running slowly or if the computer fails to respond after new hardware or software is installed.
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In terms of computer security, a switch offers better security than a hub. Why is this?
a. A hub requires a special pin to activate the connection. b. A hub forwards the data it receives to every device connected to the hub. It is possible for network devices to pick up data intended for a different device. A switch eliminates this by only forwarding data packets to the correct device whenever possible. c. A switch forwards the data it receives to every device connected to the switch. It is possible for network devices to pick up data intended for a different device. A hub eliminates this by only forwarding data packets to the correct device whenever possible. d. The use of the switch guarantees that all devices connected to it share link integrity pulses. This sharing of the pulses strengthens the security of the connection.
If you have data in Excel that you would like in an Access table, you can ________ the Excel worksheet into Access
Fill in the blank(s) with correct word
OR and NOT are examples of ________ operators
Fill in the blank(s) with correct word
An Internet store sends emails to customers and would like to use a database to keep track of which messages are sent to which customers. A message has a message id (mId), a subject (subject), and a body (body). A customer is identied by the email address (email), and customer's data includes the attributes name, sex, householdSize, and address. When an email is sent, the date (sendDate) is
recorded. You can assume any reasonable domains for these attributes. (a) Give an E-R diagram that completely describes the entities and relationships of this plan. (b) Translate the E-R diagram into SQL tables using SQL DDL, by specifying a table for messages, a table for customers, and a table for which messages are sent to which customers, in SQL DDL. (c) How to specify that the subject of a message must not be longer than 60 characters, in SQL? (d) How to require that customers at the same address all have di erent names, in SQL? (e) How to enforce the restriction that the only valid values of sex are male or female, in SQL? (f) How to specify that each message must be sent to no more than one customer, in SQL? (g) How to specify that each customer must be sent one or more messages, in SQL? (h) How to specify that each message must be sent to exactly one customer, in SQL? (i) How to specify that each customer must be sent exactly one message, in SQL? (j) How to specify that a message can be deleted only if no customer has been sent that message, in SQL? (k) Shipping department needs not be concerned with the sex and household size of the customers. Create an element of an external schema which is a view of customers that does not contain these attributes.