Which SQL statement generates the alias Annual Salary for the calculated column SALARY*12?（） SELECT ename, salary*12 ‘Annual Salary’ FROM employees;。 SELECT ename, salary*12 “Annual Salary” FROM employees;。 SELECT ename, salary*12 AS Annual Salary FROM employees;。 SELECT ename, salary*12 AS INITCAP(“ANNUAL SALARY”) FROM employee。
You are maintaining your database in Oracle10g. You perform a full user-managed backup every Sunday at 8：00 P.M. Your database is running in ARCHIVELOG mode. On Monday， at 9：00 A.M.， a tablespace is dropped. You decide to perform incomplete recovery to recover the dropped tablespace. Which two clauses can you use with the RECOVER command？（） UNTIL SEQUENCE。 UNTIL SCN。 UNTIL CHANGE。 UNTIL CANCEL。
在资产评估价值类型确定的情况下，资产评估方法选择具有（）。 多样性。 替代性。 唯一性。 随意性。 确定性。
下列对于物流的有关说法，错误的是（） 物流的对象应该包括“人”。 物流不是一个产业。 物流过程需要一体化。 物流包含储运。
Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data. This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead. What three changes will reduce disk I/O overheads?（） Use of soft links for database directories on the same physical disk。 Use of delay_key_write=ON for batch index update。 Allocation of RAM to the buffer pool such that more of the data can fit in RAM。 Placement of InnoDB log files and datadir on separate physical disks。 Use of separate directories on the same physical disk for log files and data file。
You have a large amount of historical data in an operating system file. Some analysts in your organization need to query this data. The file is too large to load into your current database. Which is the most effective method to accomplish the task？（）
