mysql联合查询和关联查询

最近面试中，Java的都会考察数据库，写SQL语句，大多数就问关联查询，索引mysql 看看下面三个关联查询的 SQL 语句有何区别？ SELECT * FROM score, student WHERE score.id = student.id ... SELECT * FROM score JOIN student ON (score.id = student.id) WHERE ...

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