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晏叔原，临淄公之暮子也。

To establish a connection, TCP uses a three-way handshake.

protocols used in the internet and similar computer networks.

undiscovered before me.

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.

The `Employee` table holds all employees including their managers.

Given a table salary, such as the one below, that has m=male and f=female values.

X city opened a new cinema, many people would like to go to this cinema.

谢太傅问诸子侄："子弟亦何预人事，而正欲使其佳？