SQL查詢語句綜合練習demo

寫SQL語句之間首先羅列各表之間的字符段，主外鍵相互對應，方便聯表查詢 create database tongji; use tongji; create table student ( Sno varchar(20) not null primary key comment"學號" , Sname varchar(20) not null comment"學生姓名", Ssex varchar

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