75、Which statements are correct regarding indexes? (Choose all that apply.)
A. A non-deferrable PRIMARY KEYor UNIQUE KEYconstraint in a table automatically attempts to creates a unique index.
B. Indexes should be created on columns that are frequently referenced as part of any expression.
C. When a table is dropped, the corresponding indexes are automatically dropped.
D. For each DML operation performed, the corresponding indexes are automatically updated.
Correct Answer: ACD
Section: (none)
Explanation:解析,有点数据库管理的意思
原文地址:https://blog.51cto.com/13854012/2361161
时间: 2024-10-10 10:05:19