Searching the DDE Database
The Basic Search can be started from any page in DDE. Simply type in a word or a phrase, press Enter or select the Find button. Phrases must be entered in "double quotes," as in "deepwater horizon oil spill." Note that the search is case insensitive; you do not have to worry about capital letters.
The tables at the end of this page indicate with a yes (Y) or no (N) which fields in the DDE database can be browsed, retrieved using Basic Search, or retrieved using the Advanced Search. The second column in the tables will tell you exactly what fields and information are responding when a Basic Search is done.
The Advanced Search can also be accessed from any page by selecting the Advanced Search tab under the search box. That tab opens the interface that allows you to conduct fielded searches, do Boolean searches, and date range searches.
The "Full Text" search option gives you the opportunity to search for words or phrases that may only appear on an HTML "landing page" and not in the metadata of the bibliographic record. The landing page is prepared by the owner or holder of the data and is intended to provide context and specific directions for using the data. Since many datasets have populations of data files nested under them, the titles of those files could also be listed on the landing page. If your search for a word in the bibliographic title field does not bring results, try that word in the full text search. Your word might be in the title of one of those "children" of the dataset.
The "Bibliographic Data" search runs against all of the fields in the collection citations or the dataset records, including the Description.
The specific fields, such as Creator/Author, Title, Sponsor, etc. allow you to narrowly focus your search and get precise results. Again, you may key in individual words to search for or phrases in double quotes. If you enter words in two different, specific fields, the DDE search engine will automatically AND them. This Boolean operator AND means you will retrieve only citations or records containing both of those words you entered.
If you wish to use the Boolean operator OR (which means you will retrieve all citations or records containing either one of these terms or both of these terms), type your search into the top search box on the Advanced Search interface.
The publication date field provides date range searching. A drop menu will open when you put an entry into either the first (starting date) or second (ending date) box. It guides you through selection of year, month, and day. You don't have to ensure you enter your dates in a particular format; the drop menu will handle that for you.
Finally, note that you can limit your search results to just datasets (matches with DOIs) or to just collections (citations, no DOIs). If you do not make a specific choice here, the search results will return both dataset records and collection records, assummiing they are otherwise relevant to your search parameters.