Explain the semantics of the triggers that are available in the DBMS that is used for your course project. Describe the syntax for de?ning these triggers.
What will be an ideal response?
Depends on the system. For instance, IBM’s DB/2 has the same semantics as the SQL standard.
You might also like to view...
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).
The RJ-48 connector is commonly used with what type of network connections?
A) Satellite B) Cable C) Ethernet D) T1 lines
If the content of an element does not include an href attribute and is nested inside a heading element, it will be formatted in a browser with the style of the parent heading element.
Answer the following statement true (T) or false (F)
Smartphones and other mobile devices often can function as a portable media player.
Answer the following statement true (T) or false (F)