tristaZero opened a new issue #4482: Correct the `DataTypeName` for each 
DataBase
URL: https://github.com/apache/incubator-shardingsphere/issues/4482
 
 
   The definition of `DataTypeName` in `RuleName.g4`(Antlr grammer file) of 
each DataBase is not correct so far, therefore this issue is created to correct 
them. The sub-task list is below,
   - [x] Correct the `DataTypeName` for `MySQL`.
   - [x] Correct the `DataTypeName` for `PostgreSQL`. 
   - [ ] Correct the `DataTypeName` for `SQLServer`. 
   - [ ] Correct the `DataTypeName` for `Oracle`. 
   - [ ] Correct the `DataTypeName` for `SQL92`. 
   
   Q1: How to learn about the definition of `DataTypeName`?
   A:
    - Official document of each DataBase, i.g 
[MySQL](https://dev.mysql.com/doc/refman/8.0/en/data-types.html).
   - [Antlr SQL grammer](https://github.com/antlr/grammars-v4/tree/master/sql)
   - Other related Website. (I am not sure. 😃 )
   
   Q2: Which file of ShardingSphere does `DataTypeName` exist?
   A: All files named with `RuleName.g4`

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