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並前往https://www.oreilly.com/library/view/mysql-cookbook/0596001452/ch04s05.html

Decomposing or Combining Strings - MySQL Cookbook [Book]

... use a substring-extraction function. To combine strings, use CONCAT( ) . ... mysql> SELECT name, LEFT(name,2), MID(name,3,1), RIGHT(name,3) FROM metal; ...

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