Fields are used to construct Records . Most fields are searchable depending on the database. Field specific searches are more precise and quicker to use than Find or commands that search all fields. File is another name for a Database . Sometimes large files like Medline are subdivided by year groupings and these groups are called files.
Limit looks for a specific value in a specified field.
It is used to restrict retrieval Sets to specific languages, human, or journal subsets. Mesh is the Thesaurus for Index Medicus and Medline and numerous other Medically related databases. It was created and is maintained by the National Library of Medicine. Mesh enables searchers to find what they need quickly and conveniently in large, complex databases. Near is a proximity Operator that specifies how many words apart two words can be.