sqlupdate 读取 MySQL 的表定义 SQL 文件，然后与现有数据库中进行比较，然后生成更新数据库结构的 SQL 语句。

sqlupdate v1.6.5 - Copyright (C) Joel Yliluoma (http://iki.fi/bisqwit/)

Usage:
    sqlupdate [options] >changes.sql
       (Creates an update script)

Options:
    -t tablefile          Describes the file containing
                          the new sql layout. Default: tables.sql
    -d database           Default: winnie3
    -h host               Default: localhost
    -u user               Default: root
    -i                    Use CREATE INDEX instead of ALTER..ADD KEY
    -m                    Add comments explaining the differences
    -c                    Ignore character set differences
    -p pass
    -r                    Reverse operation. (new->old)

Example:
  ./sqlupdate -t etimgr.sql -d etimgr | mysql -uroot

This program does not update a database. It only
produces update scripts (which show the differences).

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