题目内容
（请给出正确答案）
[单选题]
Tables in SQL query statements can be renamed to distinguish its different usages. Rename a table is used in which clause :
A.SELECT
B.FROM
C.WHERE
D.GROUP BY
提问人：网友ddxxpp
发布时间：2022-01-07
题目内容
（请给出正确答案）
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更多“Tables in SQL query statements…”相关的问题
第2题
What expressions can indicate a point?
A、as to
B、in the same way
C、in terms of
D、talking about
E、also
第3题
In log-based recovery mechanism, some transactions need to be undone, while others need to be redone to recover after a failure. <t0 start> <t0, 90 a, 100,> <t0, commit> <t1 start> <t1, 100 b, 90,> What recovery actions do we need to perform according to the given log?
A、undo(T0) & undo (T1)
B、undo(T0) & redo (T1)
C、redo(T0) & undo (T1)
D、redo(T0) & redo (T1)
第4题
"When a transaction is failed in the middle of its execution, the modification that has been made to the database by this transaction before failure time must be aborted to guarantee the consistency of database", indicates which property of transaction:
A、Atomicity
B、Consistency
C、Isolation
D、Durability
第5题
LOG file must be used in the recovery of database. To re-execute the transaction that has been committed before failure time, which command should be used on the LOG records ?
A、Undo
B、Redo
C、COMMIT
D、ROLLBACK
第6题
“A transaction should be ended either by commit or abort”, indicates which property of transaction ?
A、Atomicity
B、Consistency
C、Isolation
D、Durability
第7题
After failure, the system needs to recover before any transaction to run. Which answer is used in recovery ?
A、Table
B、Log
C、View
D、Graph
第8题
Which of the following statement is WRONG ?
A、Concurrent schedule is efficient
B、2PL can NOT avoid dead lock
C、A schedule is RIGHT if and only if obey 2PL
D、Recovery needs log files
