Super Key

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Difference between candidate key and primary key ?

If possible tell me the difference among Primary , super , candidate , minimal super key ( and other keys if there exists something else )

Thanks in advance

OK I will tell you one by one all keys

"Super Key" : Different set of attributes which are able to identify any row in the database is known as super key.

"Candidate Key" : "minimal super key" is termed as candidate key i.e. among set of super keys one with minimum number of attributes.

i.e. candidate key & minimal super key are the same.

"Primary Key" : Primary key is any attribute which is able to uniquely identify a specific row in the database.

"Foreign Key" : A foreign key is a field in a relational table that matches the primary key of another table. The foreign key can be used to cross-reference tables.

These are the basic keys used in RDBMS.

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The Super Chromonica by M Hohner Key of C Made in Germany W Orig Case
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NEW HOHNER SUPER CHROMONICA KEY OF C 12 HOLE 48 REED CHROMATIC 270 48 270CX
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Hohner 270 Super Chromonica Chromatic Harmonica Key of B
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HOHNER harmonica Super Chromonica 270 X 270 48 key G F S NEW
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HOHNER Super Chromonica 270 Deluxe Harp Chromatic Harmonica Key of C New
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HOHNER Horner Super Chromonica 270 270 48 Key C chromatic harmonica
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Vintage M Hohner 270 Super Chromonica Key of C chromatic harmonica Germany
Vintage M Hohner 270 Super Chromonica Key of C chromatic harmonica Germany
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NEW HOHNER 270BX SUPER CHROMONICA 270 KEY OF B GERMANY MADE SALE PRICE
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Hohner Super Chromonica 270 Harmonica Key of C New
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HOHNER SUPER CHROMONICA 270 CHROMATIC HARMONCA KEY OF C
HOHNER SUPER CHROMONICA 270 CHROMATIC HARMONCA KEY OF C
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HOHNER Super Chromonica 270 Deluxe Harp Chromatic Harmonica Key of C Brand New
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Hohner 270BX D Super Chromonica Key Of D Major
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Hohner Super Chromonica Key of C + Hohner HH01 Harmonica Hol Value Bundle
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HOHNER Super 64X 7584 64 Key of C chromatic harmonica Japan Expedited Shipping
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TOMBO Tremolo Double Tone Harmonica 1921C Super Special Grade Key C Japan
TOMBO Tremolo Double Tone Harmonica 1921C Super Special Grade Key C Japan
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HOHNER 7540 SUPER CHROMONICA 270 DELUXE HARMONICA KEY OF C HARP SALE 159
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M Hohner Super Chromonica G Key Harmonica
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Hohner 270 Key BbA+B Super Chromonica Chromatic Harmonica Cleaned 109
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Seydel Favorite Harmonica LOW SUPER LOW  HIGH Solid Aluminum Comb Key Choice
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