# Quiz

+ Is there a correct description of the KV mapping principle of SCHEMA in a TiDB database? (Select 2)
  + `A` . VALUE in a clustered table KV stores real row data
  + `B` . When creating a table, the default is a clustered table
  + `C` . Each region divides the data storage range according to the interval between left and right, such as [a ~ d), [d ~ g)
  + `D` . Non-clustered table If there is a primary key, the key in the KV will contain the primary key column
  + `E` . Non-clustered tables will also return tables if filtered by primary key in the where condition

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C, E