| 11. | The columns subset which uniquely identifies a row is called the primary key.
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| 12. | In that case that would be the primary key to the BookCopy table.
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| 13. | For example, sometimes I receive data from our vendors with duplicate primary keys.
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| 14. | Later in the war, teamwork became the primary key to success and survival.
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| 15. | In the SQL Standard, primary keys may consist of one or multiple columns.
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| 16. | Each MSISDN is also a primary key to the HLR record.
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| 17. | The first asserts the primary key of the piece, that is, the tonic.
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| 18. | I . e ., all primary key values and such would be identical.
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| 19. | In the column-oriented system, the primary key is the data, mapping back to rowids.
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| 20. | The primary key is the composite of all three columns.
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