Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2(30) JOB_ID NUMBER\ SAL NUMBER MGR_ID NUMBER References EMPLOYEE_ID column DEPARTMENT_ID NUMBER Foreign key to DEPARTMENT_ID column of the DEPARTMENTS table You created a sequence called EMP_ID_SEQ in orderto populate sequential values for the EMPLOYEE_ID column of the EMPLOYEES table. Which two statements regarding the EMP_ID_SEQ sequence are true? () You cannot use the EMP_ID_SEQ sequence to populate the JOB_ID column.。 The EMP_ID_SEQ sequence is invalidated when you modify the EMPLOYEE_ID column.。 The EMP_ID_SEQ sequence is not affected by modifications to the EMPLOYEES table.。 Any other column of NUMBER data type in your schema can use the EMP_ID_SEQ sequence.。 The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEES table.。 The EMP_ID_SEQ sequence is dropped automatically when you drop the EMPLOYEE_ID column.。
在制动中立位,104型分配阀均衡活塞下方通客积室,上方通()。 制动缸。 工作风缸。 副风缸。 滑阀室。
You plan to control idle sessions that are blocking other sessions from performing transactions. Your requirement is to automatically terminate these blocking sessions when they remain idle for a specified amount of time. How would you accomplish this task?() Set metric threshold。 Implement Database Resource Manager。 Enable resumable timeout for user sessions。 Add directives to Automatic Database Diagnostic Monitor (ADDM)。
国家电网公司对风电场功率预测的要求是什么?
Which of the following customer environments is addressed by IBM System Storage N series gateways?() a customer with CIFS, NFS and GPFS requirements 。 a customer wanting to natively implement Easy Tier 。 a customer who has large block sequential write requirements 。 a customer who needs to consolidate multiple storage controllers under one managementinterface&e。
假日,我和妻子去风景区游玩。天气预报说有雨,我们带了伞。那天果然下起了大雨。游人很多,有不少人没带伞,大雨瓢泼而下,他们立刻就被淋成了落汤鸡,一个个狼狈不堪。我和妻子安然无事,只是雨水打湿了一点裤腿,鞋子沾上了一点泥巴。那天妻子很快乐。过了一天,我们去另一个地方游玩。天气预报还是说有雨,我们照旧带了伞。可是那天却没有下雨,于是雨伞成了我们手中的累赘。看看别的游客没有带伞,两手空空十分轻松的样子,妻就开始后悔:不该带伞。这一天妻子不快乐。妻说:“昨天大雨把别人淋成落汤鸡没把我淋着,所以我快乐。今天别人手里没有累赘,我有累赘所以我不快乐。”于是我又明白了:为什么昨天我们会为有了一辆自行车而快乐得睡不着觉,今天有了轿车却烦心得吃不下饭?不是因为自己走得比过去慢了,而是因为过去你骑车比别人走得快,今天你的“捷达”却赶不上别人的“奔驰”。我明白了很多很多,但有一条不明白:干吗老是把眼睛盯住别人?自己觉得快乐,这还不够吗?有什么理由要自寻烦恼,让自己的快乐在跟别人的比较中变成不快乐呢?
这位妻子的情绪变化主要源于()