ALTER TABLE customer ADD CONSTRAINT customer_number_unique UNIQUE (customer_number);
Answer:
All of the above
Explanation:
It's better to have a pattern of colors than one single color in you color scheme.
Answer:
Better regulate time spent on internet
Explanation:
Because of the time Alicia is spending on the internet, seeing interesting things that her friends are doing, and perhaps her life has been boring, this tend to play with her psychology and she will begin to become depressed and start disliking her life. In this case, the main mediator is the internet, and the best way she can deal with depression at this level is to reduce or regulate the amount of time that she spends on the internet.