Question: what are the different types of keys in sql?
Answer: Super Key. Super key is a set of one or more than one keys that can be used to identify a record uniquely in a table. ... 
Candidate Key. A Candidate Key is a set of one or more fields/columns that can identify a record uniquely in a table. ... 
Primary Key. ... 
Alternate key. ... 
Composite/Compound Key. ... 
Unique Key. ... 
Foreign Key.