See complete series of DBMS:
In this lecture, I have described all types of keys(Super key, Candidate Key, Primary Key, Alternate Key, Secondary Key) in DBMS with examples. Discussed all the important points about keys in DBMS,
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Operating Systems: //www.youtube.com/playlist?list=PLdo5W4Nhv31a5ucW_S1K3-x6ztBRD-PNa
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