SQL_STUDY:7.SQL JOIN - Code World

SQL_STUDY:7.SQL JOIN

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SQL_STUDY:7.SQL JOIN

SQL_STUDY: 7.SQL JOIN

SQL_STUDY：JOINを7.SQL

Что мне делать, если я использую JOIN для запроса повторяющихся данных? Как написать SQL, используя статистику подсчета?

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