The EMPLOYEES table contains these columns: EMPLOYEE_ID NUMBER(4) ENAME VARCHAR2 (25) JOB_ID VARCHAR2(10) Which SQL statement will return the ENAME, length of the ENAME, and the numeric position of the letter "a" in the ENAME column, for those employees whose ENAME ends with a the letter "n"?（） SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, 'a') FROM EMPLOYEES WHERE SUBSTR (ENAME, -1,1) = 'n';。 SELECT ENAME, LENGTH(ENAME), INSTR(ENAME, ,-1,1) FROM EMPLOYEES WHERE SUBSTR (ENAME, -1,1) = 'n';。 SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR (ENAME, 1,1) = 'n';。 SELECT ENAME, LENGTH(ENAME), SUBSTR(ENAME, -1,1) FROM EMPLOYEES WHERE INSTR (ENAME, -1,1) = 'n'。
西美尔认为劳动分工有什么影响。
You want to access employee details contained in flat files as part of the EMPLOYEE table. You plan to add anew column to the EMPLOYEE table to achieve this. Which data type would you use for the new column（） CLOB。 BLOB。 BFILE。 LONG RAW。
What is the correct order of the following commands if you wanted to restore datafile 4， which was accidentally removed from the file system？（） a. sql ’alter database datafile 4 online’ b. restore datafile 4 c. recover datafile 4 d. sql ’alter database datafile 4 offline’ e. startup f. shutdown a， c， b， d。 d， b， c， a。 f， d， b， c， a， e。 c， a， b， d， f。 a， b， d， e。
中小学的（）是中小学校的学生必须遵守的行为准则。
An architectural design company with 45 employees has their office located within 5 kilometers oftheir disaster recovery center. They have an IBM System Storage N6040 installed at bothlocations. In this customer environment what protocol would be used for disaster recovery？（）
