boluor commented on issue #3213:
URL: https://github.com/apache/doris-website/issues/3213#issuecomment-4525904340

   Fair feedback on the example. The doc shows \`UNIQUE KEY(user_id, 
user_name)\` to illustrate that the Unique Key model treats the whole key tuple 
as the primary identifier — not because \`user_id\` alone wouldn't suffice, but 
to demonstrate the multi-column key syntax. In practice you're right that 
production tables usually pick a single id column.
   
   A clearer note here would be: "Unique Key may be a single column or a column 
tuple; rows are unique on the whole key. Choose the minimal set of columns that 
uniquely identifies a row." Will think about wording in a follow-up edit.


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