# Quiz

+ What is incorrect about the design of SCHEMA in the TiDB database?
  + `A` . AUTO_RANDOM and AUTO_INCREMENT cannot appear in the same column at the same time
  + `B` . NOW function can be used as a default value for time and date types
  + `C` . Non-clustered indexes can be added or removed after the table is created
  + `D` . PRE_SPLIT_REGIONS is a column attribute, written after the auto increment column when used

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D