order by Phone_Number desc limit limit 1

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order by Phone_Number desc limit limit 1
order by Phone_Number desc limit limit 1

order by Phone_Number desc limit limit 1
这个目测是 MySQL 数据库的关键字.
LIMIT 接受一个或两个数字参数.参数必须是一个整数常量.如果给定两个参数,第一个参数指定第一个返回记录行的偏移量,第二个参数指定返回记录行的最大数目.初始记录行的偏移量是 0(而不是 1)
limit 1 意味着只返回 1行.
order by Phone_Number desc limit 1 意味着只返回 Phone_Number 最大的那行.

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