We cover primary and foreign key for entities. Each entity in a DB environment should a primary key (PK). A PK attribute cannot be null. However, a foreign key (FK) is optional and is not mandated in all scenarios. In this activity, you need to narrate three database environments (book store, tax office, movie database, etc.) with two entities and show the entities of DB with the PK and FK. Out of three scenarios
- At least one should involve 2-attribute PK,
- At least one should have only 1-attribute PK
- At least one should have PK-FK relationships.
Each attributes should have at least three attributes. See attached file my examples scenarios. Report your scenarios in a one-page PDF file and submit to D2L.

Your task this week is to write a very simple spam classifier in python. it will classify messages as either spam (unwanted) or ham (wanted). the program will have a set of spam_words, words that are known to appear in spam messages. that set is included in the template file spam. pypreview the document. you will also define a spam threshold which reflects the allowed percentage of spam words in the message. you'll compute a 'spam indicator', which is the ratio of spam words to the total number of unique words in the message. if the spam indicator exceeds the spam threshold, the message is classified as spam. otherwise it is classified as ham. we'll assume that the spam threshold is a constant and has a value of 0.10. your program will prompt the user for a message and then will print the corresponding spam indicator with two decimal digits and the corresponding classification (spam or ham). the program will be case insensitive. the spam words are detected whether they are in lower case or upper case or mixed case. each word, spam or not, is counted once (even if it appears multiple times in the message.) the program will remove punctuation from the message before identifying the words and computing the spam indicator. for example '! ' must be identified as the spam word 'now'.

How do i delete my account on this because i didn't read this agreements and also i put age at xd

Visually impaired individuals generally rely on the for navigation. thus, designers need to ensure that mouse-specific inputs, such as pointing, clicking, and hovering, can be done without a mouse.