# Quiz

+ What are the following statements about the transformation of relational data and KV?
  + `A` . If no primary key is defined, the key contains rowId, Index ID, and Table ID, all of which are int64 types
  + `B` . Table IDs are unique across the cluster
  + `C` . If a primary key is defined, the primary key will be used as the rowID
  + `D` . You don't need to specify a primary key for each table

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C