(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

________