数据库管理系统
You created the ORDERS table in your database by using the following code: SQL> CREATE TABLE ORDERS (ORDER_DATE TIMESTAMP(0) WITH TIME ZONE); Then, you inserted data in the ORDERS table and saved it by issuing the following statements:SQL> INSERT INTO ORDERS VALUES(’18-AUG-00 10:26:44 PM America/New_York’); SQL> INSERT INTO ORDERS VALUES(’23-AUG-02 12:46:34 PM America/New_York’); SQL> COMMIT; Next, you issued the following statement to change the time zone for the database: SQL> ALTER DATABASE SET TIME_ZONE=’Europe/London’; What will be the result of executing the above statement?() The statement will fail.。 The statement will be executed successfully, and the new time zone will be set for the database.。 The statement will be executed successfully, but the new time zone will be set for the current session.。 The statement will be executed successfully, but the new time zone will neither be set for the database nor for a specific session.。
吉分商品的需求量与价格() 成反比例关系。 成正比例关系。 没有关系。 有一定关系。
直流他励电动机重载运行时,若不慎将励磁回路断开,电机转速将()。 升至新的稳定值。 增至不允许的值,即“飞车”。 减速至新的稳定值。 迅速减少直至停止。
立体划线一般要选择()划线基准。 二个。 三个。 四个。 六个。
水利改革发展的指导思想中要求做到“三个把”,以下哪个选项不属于“三个把”()