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I think they’re saying that e.g. you shouldn’t index a natural key unless you know that you’re going to search/collate by that key as a column. Telling the database that a certain column contains (a component of) the primary key is adding a restriction to that column.
I think they’re saying that e.g. you shouldn’t index a natural key unless you know that you’re going to search/collate by that key as a column. Telling the database that a certain column contains (a component of) the primary key is adding a restriction to that column.