What is an fdb command on ProQuest Dialog and how is it used to limit searches to specific databases?



The fdb (or "From DataBase") command is used in a multi-file search strategy on ProQuest Dialog to restrict particular search terms to specific database(s).

This is particularly useful with dealing with long and complex search strategies.

The fdb command is always applied at the end of a search statement in this form:

Term AND fdb(database name)
or
Term AND fdb(database code)

For example, in a multi-file search involving Biosis Previews; Embase; Medline; you may want to restrict a search term to only Biosis Previews.

Database name:
Mesh("epilepsy")
Emb("epilpesy")
epilepsy AND fdb(biosispreviews)

Database code:
Mesh("epilepsy")
Emb("epilpesy")
epilepsy AND fdb(10000127)

The result is epilepsy as a free text term will only be searched in Biosis Previews.

You can also group together fdb codes in a single search statement.

A search includes four databases: Biosis Previews; Derwent Drug File; Embase; Medline. This time, the free text terms need to be restricted to Biosis Previews and Derwent Drug File.

Database name:
Mesh("epilepsy")
Emb("epilpesy")
epilepsy AND fdb(biosispreviews,derwentdrugfile)

Database code:
Mesh("epilepsy")
Emb("epilpesy")
epilepsy AND fdb(10000127,10000133)
NOTE: This command will only work in a multi-file environment

For a list of available fdb command database names/codes - please see the article under the Related Topics section.