A database has been an essential tool for scientific research.Nowadays, we cannot think of a research without consultingdatabases on the web. A database is now used for consultingfacts, building hypotheses, finding relationship amongst different phenomena, and so forth. But when we want to conductthe action above, we always face the fundamental problems;which database is most appropriate to address the questionand what is the usage of the database? These problems seemto be solved by using a sophisticated search engine on theweb, but we often encounter difficulties in finding the appropriate key words for the search. A well edited guidebook fordatabases can still be a good pointer in such a situation.
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