2 A common question of life: What makes me unique?

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2.1 The database recognises all its rows: Internal unique identifiers

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2.2 The unchallenged unique identifier: Primary key constraints

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2.3 Being more unique than just a number: Unique Key constraints

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2.4 Uniqueness as inheritance: Unique indexes

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2.5 Some examples of unique identifiers

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2.6 Best practices when defining unique identifiers

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2.7 Best practices for sequences and identity columns

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