You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty. Which statement accomplishes this task?（） [" ALTER TABLE students ADD PRIMARY KEY _ id;"," ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);"," ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;"," ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);"," ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id)"]
You have two databases， FINDB and PAYDB， on single operating system and using Optimal Flexible architecture （OFA）. FINDB is functional and is currently being accessed by the users. While starting up the instance for the PAYDB database you get the following error： ORA-01081： cannot start - already running ORACLE - shut it down first Which environmental variable would you set before starting up the PAYDB database to overcome this error？（） ["ORA_PATH","ORACLE_SID","ORACLE_BASE","ORACLE_HOME","LD_LIBRARY_PATH"]
反应
A customer is cost-justifying advanced software functions of several disk subsystem vendors.Which of the following software features of the Storwize V7000 are provided at no charge?（） ["Easy Tier, FlashCopy, Thin Provisioning ","Easy Tier, External Virtualization, FlashCopy ","Easy Tier, Metro\/Global Mirror, Thin Provisioning ","Metro\/Global Mirror, FlashCopy, External Virtualizatio"]
弗来明发现青霉素是由于观察到在产黄青霉菌菌落周围不见有革兰阳性细菌生长，而再深入研究创造奇迹的。这是人类首次观察到的微生物之间的（） ["捕食关系","寄生关系","非专一性拮抗关系","专一性拮抗关系"]
报告中指出：以公共性、民主主义、卓越性三大原理作为（）的哲学。将校长的办学理念转化为全校教职员工的共识，是学习型组织建设的（）。
