When you search PubMed I believe you are searching MEDLINE only. I'm not aware of a list of every database available. Is the student interested in biomedical databases only or ALL databases? There are many libguides with lists of recommended databases for systematic reviews but I'm not aware of a comprehensive list of all databases.
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Laurel Scheinfeld MSLISHealth Sciences LibraryStony Brook University
Health Sciences Tower, Level 3, Rm 136
Stony Brook, NY 11794-8034
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"Great opportunities to help others seldom come, but small ones surround us every day." Sally Koch