多选题
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
相似试题
Which statement is true？（）
单选题查看答案
Which two statements are true？（）
多选题查看答案
Which four statements are true？（）
多选题查看答案
Which statements are true about checkpointing（）
多选题查看答案
Which statements are true regarding listeners（）
多选题查看答案
Which command creates an image copy？（）
单选题查看答案
Which statement is true regarding subqueries?（）
单选题查看答案
Which statement is true regarding synonyms?（）
单选题查看答案
Which three operations require undo data（）
多选题查看答案