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MySQL各种数据表类型重设自增起始值的方法
MyISAM数据表
删除最大编号的记录后，该编号不可重用。
可在建表时可用"AUTO_INCREMENT=n"选项来指定一个自增的初始值，
建表后可用alter table table_name AUTO_INCREMENT=n命令来重设自增的起始值。
HEAP数据表
HEAP数据表从MySQL4.1开始才允许使用自增列。
可在建表时可用"AUTO_INCREMENT=n"选项来指定一个自增的初始值，建表后可用alter table table_name AUTO_INCREMENT=n命令来重设自增的起始值。
BDB数据表
不可在 CREATE TABLE 时使用"AUTO_INCREMENT=n"选项来指定自增的初始值， 也不可通过alter table table_name AUTO_INCREMENT=n命令来改变自增初始值。
InnDB数据表
不可在 CREATE TABLE 时使用"AUTO_INCREMENT=n"选项来指定自增的初始值， 也不可通过alter table table_name AUTO_INCREMENT=n命令来改变自增初始值。
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