Isn’t the source almost always an indexed primary key? | Hacker News

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ComputerGuru on Nov 8, 2021 | parent | context | favorite | on: A terrible schema from a clueless programmer

Isn’t the source almost always an indexed primary key?

zeroimpl on Nov 9, 2021 [–]

No. The target is normally a primary key but the source is not. The source is rarely even unique.

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