5.1. a) Cho lược đồ quan hệ Q(ABCD), r là một quan hệ trên Q.
(a) 2
(b) 3
(c) 4
(d) 5
(e) None of the above
(f) All FDs must involve the attributes of the same relation.
(g) All FDs must involve only a single attribute on the left side.
(h) All FDs must involve only a single attribute on the right side.
(i) All FDs must involve only single attributes on both sides.
(j) None of the above
(k) SUM
(l) MAX
(m) MIN
(n) COUNT
(o) MEDIAN
(p) Select
(q) Where
(r) Find
(s) Having
(t) FROM
(u) WHERE
(v) HAVING
(w) GROUP BY
(x) Order By
(y) Group By
(z) Having
(aa) Sort
(bb) intersection
(cc) union
(dd) difference
(ee) product
(ff) 4.
(gg) 8.
(hh) 16.
(ii) 20.
(jj) A
(kk) E
(ll) B
(mm) D
(nn) (b) and (d)
R
(oo) SELECT * FROM emp WHERE empid = 493945;
(pp) SELECT empid FROM emp WHERE empid= 493945;
(qq) SELECT empid FROM emp;
(rr) SELECT empid WHERE empid = 56949 AND lastname = 'SMITH';
(ss) SELECT ProductName FROM products WHERE ProductID IN (10,11,42)
(tt) SELECT ProductName FROM products WHERE ProductID IN 10 OR 11 OR 42
(uu) SELECT ProductName FROM products WHERE ProductID = (10,11,42)
(vv) SELECT ProductName FROM products WHERE ProductID IS (10,11,42)
(ww) None of the above
(xx) SELECT ProductName FROM products ORDER BY ProductName DESC
(yy) SELECT ProductName FROM products ORDER BY ProductName ASC
(zz) SELECT ProductName FROM products SORTED BY ProductName ASC
(aaa) SELECT ProductName FROM products SORTED BY ProductName DESC
(bbb) None of the above
(ccc) SELECT DISTINCT ProductID FROM order_details
(ddd) SELECT ProductID FROM order_details ONLY ONCE
(eee) SELECT ProductID FROM order_details
(fff) SELECT UNIQUE ProductID FROM order_details
(ggg) None of the above
(hhh) SELECT cid, sum (qty) from orders group by cid having sum(dollars) > 2000;
(iii) SELECT aid, avg (qty) from orders group by aid;
(jjj) SELECT cid, sum (dollars) from orders;
(kkk) SELECT count (*) from orders;
(lll) SELECT * FROM EMPLOYEES SORT BY SALARY DESCENDING;
(mmm) SELECT * FROM EMPLOYEES IN ORDER OF SALARY;
(nnn) SELECT * FROM EMPLOYEES ORDER BY SALARY DESC;
(ooo) SELECT * FROM EMPLOYEES ORDER BY SALARY;
(ppp) The two tables must have only one column exact same columns.
(qqq) The tables in the join need to have common rows.
(rrr) The two tables must both have primary keys
(sss) The two tables must have a common column.
(ttt) The minimum value of product_description will be displayed.
(uuu) An error message will be generated.
(vvv) The first product description alphabetically in product_v will be shown.
(www) none of the above
d) D C V N
(xxx) To query the database for unknown values
(yyy) To query the database for a range of values
(zzz) To query the database for a character pattern
(aaaa) To query the database for values in a specified list
(bbbb) A group function
(cccc) Produced as a result of a join select statement with no where clause
(dddd) The result of fuzzy logic
(eeee) A special feature of Oracle Server
(ffff) master query.
(gggg) subquery.
(hhhh) superquery.
(iiii) multi-query.
(jjjj) The two tables must have the exact same columns.
(kkkk) The tables in the join need to have common rows.
(llll) The two tables must both have primary keys
(mmmm) The two tables must have at least one common column.
(nnnn) Candidate key
(oooo) Foreign key
(pppp) Primary key
(qqqq) All of the above
(rrrr) A and C
(ssss) Partial Dependence
(tttt) Transitive Dependence
(uuuu) Full Dependence
(vvvv) A and B
(wwww) None of the above
(xxxx) I only
(yyyy) II only
(zzzz) I and III only
(aaaaa) II and III only
(bbbbb) 1NF
(ccccc) 2NF
(ddddd) 3NF
(eeeee) BCNF
(fffff) BCNF
(ggggg) 3NF
(hhhhh) 1NF
(iiiii) None of the above
(jjjjj) 2
(kkkkk) 3
(lllll) 5
(mmmmm) 6