每个移植文件开始的序列数都比前面的移植文件大，并且该数字符合位于数据库特殊表中的方案版本。
Each migration file starts with a sequence number one greater than the previous migration file, and that number corresponds to the schema version kept in a special table in the database.
就像表名需要避免缩写，全字头缩写或者特殊字符。
Just like with naming tables, avoid using abbreviations, acronyms or special characters.
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