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In SQL, keys are special fields or combinations of fields that help uniquely identify records, maintain connections between tables, and insure data integrity.
Then are the different types of keys in SQL — explained easily and simply

1. Primary crucial
   Uniquely identifies each record in a table.
   Can not have NULL values.
   A table can have only one primary key( which may correspond of multiple columns — compound key).
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   illustration
   PRIMARY KEY( student_id)
2. Foreign Key
   Establishes a link between two tables.
   Refers to the primary key of another table.
   Ensures referential integrity.
   illustration
   FOREIGN KEY( course_id) REFERENCES courses( course_id)
3. seeker crucial
   A table can have multiple seeker keys.
   One seeker key becomes the primary key.
4. Composite Key( or emulsion Key)
   illustration
   PRIMARY KEY( order_id, product_id)
5. Alternate crucial
   The seeker keys other than the primary key.
   They can also uniquely identify rows.
6. Unique crucial
   Ensures all values in a column are unique.
   illustration
   UNIQUE( dispatch)
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7. Super Key
   A combination of columns that can uniquely identify a row but may have redundant gratuitous fields.
   seeker keys are minimum super keys.
8. Surrogate crucial
   An artificial or system- generated key( like bus- proliferation ID).
   Not deduced from business data.
   Used when no natural key exists.
   illustration
   INT AUTO_INCREMENT
9. Natural crucial
   A key that comes from real- world business data.
   illustration dispatch, SSN, Aadhar number, etc.

Summary Table
crucial Type Description
Primary crucial Unique Not Null
Foreign crucial Links tables
Unique crucial Unique, allows NULL
Composite KeyMulti-column crucial
seeker crucial Possible primary keys
Alternate crucial seeker key not chosen as PK
Super Key Unique but not minimum
Surrogate crucial bus- generated crucial
Natural crucial Real- world data crucial
still, I can also give you exemplifications with tables, or help you prepare SQL interview answers on keys, If you want.

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Final studies
SQL is one of the most important chops for anyone entering the world of data and IT.
Whether you want to work in software development, business analytics, ERP systems, or
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