Review QuestionsModule 14
14.1. Discuss attribute semantics as an informal measure of goodness for a relation schema. <\/p>\n
14.2. Discuss insertion, deletion, and modification anomalies. Why are they considered bad? Illustrate with examples. <\/p>\n
14.3. Why should NULLs in a relation be avoided as much as possible? Discuss the problem of spurious tuples and how we may prevent it. <\/p>\n
14.4. State the informal guidelines for relation schema design that we discussed. Illustrate how violation of these guidelines may be harmful. <\/p>\n
14.5. What is a functional dependency? What are the possible sources of the information that defines the functional dependencies that hold among the attributes of a relation schema? <\/p>\n
14.6. Why can we not infer a functional dependency automatically from a particular relation state? <\/p>\n
14.7. What does the term\u00a0unnormalized relation\u00a0refer to? How did the normal forms develop historically from first normal form up to Boyce-Codd normal form? <\/p>\n
14.8. Define first, second, and third normal forms when only primary keys are considered. How do the general definitions of 2NF and 3NF, which consider all keys of a relation, differ from those that consider only primary keys? <\/p>\n
14.9. What undesirable dependencies are avoided when a relation is in 2NF? <\/p>\n
14.10. What undesirable dependencies are avoided when a relation is in 3NF? <\/p>\n
14.11. In what way do the generalized definitions of 2NF and 3NF extend the definitions beyond primary keys? <\/p>\n
14.12. Define\u00a0Boyce-Codd normal form. How does it differ from 3NF? Why is it considered a stronger form of 3NF? <\/p>\n
14.13. What is multivalued dependency? When does it arise? <\/p>\n","protected":false},"excerpt":{"rendered":"
Review QuestionsModule 14 14.1. Discuss attribute semantics as an informal measure of goodness for a relation schema. 14.2. Discuss insertion, deletion, and modification anomalies. Why are they considered bad? Illustrate with examples. 14.3. Why should NULLs in a relation be avoided as much as possible? Discuss the problem of spurious tuples and how we may […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[13],"class_list":["post-11660","post","type-post","status-publish","format-standard","hentry","category-research-paper-writing","tag-management"],"_links":{"self":[{"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/posts\/11660","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/comments?post=11660"}],"version-history":[{"count":0,"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/posts\/11660\/revisions"}],"wp:attachment":[{"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/media?parent=11660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/categories?post=11660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/papersspot.com\/blog\/wp-json\/wp\/v2\/tags?post=11660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}