The #REF error means that ________
A) the required value has been left out of an argument
B) the cell you are referencing no longer exists
C) you are using the wrong type of data
D) you are referencing an invalid number
B
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When a(n) ________ address is assigned to a computer, its IP address will not change
Fill in the blank(s) with correct word
Pages in a database have P bytes. A table T has R rows and n integer attributes, A1, A2, .An. Each attribute is r bytes long. Assume that r is much greater than the size of a pointer, so the pointer size can be ignored when computing the size of an entry in an index. Assume that the domain of A1 is the integers between 1 and 100 and that the values of this attribute are randomly distributed in
the domain. Consider the following statement:
SELECT A2 FROM T WHERE A1 <= 50 AND A1 > 25Evaluate the cost, in terms of the number of I/O operations, of executing the statement under the following conditions. In order to get credit you must explain your work clearly. (a) The table is stored as a heap (no indexes). (b) There is a non-integrated (separate index file) clustered index with search key A1. (c) There is an unclustered index with search key (A2, A1).
Joins are created between a(n) ________ that exists in both tables
Fill in the blank(s) with correct word
The specific content of a field is referred to as the ____.
A. field content B. field value C. table value D. column value