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题目网址：https://sqlzoo.net/wiki/Using_Null select name from teacher where dept is null SELECT teacher.name, dept.name FROM teacher INNER JOIN dept ON (teacher.dept=dept.id) select ...

题目网址：https://sqlzoo.net/wiki/More_JOIN_operations/zh SELECT id, title FROM movie WHERE yr=1962 select yr from movie where title='Citizen Kane' select id,title,yr from movie where title lik...

SQLZOO The_JOIN_operation 答案 题目网址：https://sqlzoo.net/wiki/The_JOIN_operation/zh SELECT matchid,player FROM goal WHERE teamid = 'GER' SELECT id,stadium,team1,team2 FROM game WHERE id='1012' ...