Question
(yes/no) If ID ? name and name ? salary are FDs of a schema, then is ID ? salary also a FD of the schema?
(yes/no) If ID ? name and name ? salary are FDs of a schema, then is ID ? salary also a FD of the schema? ______
(yes/no) If a relation schema has a functional dependency, does that mean that instances of the schema definitely have redundancy? ______
Consider schema student(ID, name, tot_cred), where the attributes have the same meanings that we know from the courses DB weve used in class. Which of the following do you think should be FDs of this schema?
name ? tot_cred
tot_cred ? name
ID ? name
ID ? tot_cred
select all that apply: ________
Consider the relation schema customer(first, last, zip, city, state) used in a companys customer database. Which of these do you think should be FDs of the schema?
first ? last
state ? zip
zip ? state
last ? city
select all that apply: ________
(true/false) If a table satisfies a FD A ? B (where A,B are sets of attributes), then no two rows of the table that have the same values for the attributes in A can have the same values for the attributes in B. _______
(true/false) Every FD is a candidate key ________
Homework - Week 14
(yes/no) Suppose ID ? dept_name and ID ? name are FDs of a schema. Then is ID ? dept_name, name also a FD of the schema? ______
ConsidertheschemaR(a,b,c,d),whereb?cisaFD. IsRinBCNF?
yes
no
we cant be sure
________
ConsidertheschemaR(a,b,c,d),wherec?disaFD. IsRinBCNF?
yes
no
we cant be sure
________
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