If you are new to SWOT analysis, check out this definition from A Dictionary of Business & Management.
If your instructor has asked you to do a SWOT analysis, be sure to check if you are to create one from scratch, or if you are allowed to review ones created by professionals.
When searching LexisNexis Company Dossier, search for your company, and then choose Generate Report.
From there, go to Industry Knowledge and check the SWOT boxes:
When searching in Business Source Premier, enter the company name and in the second box, enter SWOT as a title (not a keyword).