二维F-K偏移，声波波动方程程序，偏移归位算法。-Two-dimensional FK migration, acoustic wave equation program, offset algorithm

现将举行一个餐会，让访客事先填写到达时间与离开时间，为了掌握座位的数目，必须先估计不同时间的最大访客数。 -Now hold a banquet, so that visitors fill out in advance the arrival time and departure time in order to keep the number of seats, you must first estimate the maximum number of visitors at diffe

SSD7.ER Mapping Map your ER schema into a relational database schema, using the mapping algorithm. Express the resulting relational database schema, using the following notation: PK for Primary Key, AK for Alternate Key, and FK for Foreign Key