Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMPLOYEES e, DEPARTMENTS d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?（） ["selection, projection, join","difference, projection, join","selection, intersection, join","intersection, projection, join","difference, projection, product"]
下列属于动力密封的是（） ["油封","平垫密封","填料","离心密封"]
You work as a database administrator for Certkiller .com. In a production environment， users complain about the slow response time when accessing the database. You have not optimized the memory usage of the Oracle instance and you suspect the problem to be with the memory. To which type of object would you refer to determine the cause of the slow response？（） ["The trace file","The fixed views","The data dictionary views","The operating system log fields","The dynamic performance views."]
圆钢与圆钢搭接的长度应为其自身直径的（）倍，并且要求上下搭接，焊接时要求双面焊接。 ["2","4","6","10"]
In your multitenant container database (CDB) containing pluggable databases (PDB), users complain about performance degradation. How does real-time Automatic database Diagnostic Monitor (ADDM) check performance degradation and provide solutions?（） [" It collects data from SGA and compares it with a preserved snapshot."," It collects data from SGA, analyzes it, and provides a report."," It collects data from SGA and compares it with the latest snapshot."," It collects data from both SGA and PGA, analyzes it, and provides a report"]
2004年1月，原告杨某（男）结识了被告韩某（女）。同年8月27日，韩某用手机发短信给杨某，向他借钱应急，短信中说：“我需要5000元，刚回北京做了眼睛手术，不能出门，你汇到我的卡里。”杨某见短信后立即将钱汇给了韩某。一周后，杨某再次收到韩某的短信，又借给其6000元并汇到了韩某的账户。因都是短信来往，两次汇款杨先生都没有索要借据。借了两次钱后，韩某非但没有还钱，反而继续向杨某借钱。杨某起了疑心，要求韩还钱。但几经催要，韩某只是发短信说：“我一定还，但需要等一段时间。”可韩某还是久欠未还，杨某逐将韩某告上了法庭。并提交了银行汇款单存单两张。但韩某却称这是杨先生归还以前欠她的欠款。法院审理认为，手机短信载明的款项数额、往来时间与杨某在银行的业务凭证相符，同时短信还载明了被告承诺偿还借款的意思表示，证据间相互印证，故可以认定被告向原告借款的事实。据此，法院判令被告韩某偿还原告人民币1.1万元。本案中的手机短信是数据电文吗？其证据力如何？
