（多选题）
Which statements are correct regarding indexes？ （）
A When a table is dropped， the corresponding indexes are automatically dropped.
B For each DML operation performed， the corresponding indexes are automatically updated.
C Indexes should be created on columns that are frequently referenced as part of an expression.
D A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a uniqueindex.
正确答案
答案解析
略
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