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Oracle认证考试

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Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables: EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2(60) Which UPDATE statement is valid?()

  • A、UPDATEnew_employeesSETname=(SELECTlast_nameFirst_nameFROMemployeesWHEREemployee_id=180)WHEREemployee_id=180;
  • B、UPDATEnew_employeesSETname=(SELECTlast_nameFirst_nameFROMemployees)WHEREemployee_id=180;
  • C、UPDATEnew_employeesSETname=(SELECTlast_nameFirst_nameFROMemployeesWHEREemployee_id=180)   WHEREemployee_id=(SELECTemployee_idFROMnew_employees);
  • D、UPDATEnew_employeesSETname=(SELECTlast_nameFirst_nameFROMemployeesWHEREemployee_id=(SELECTemployee_idFROMnew_employees)   WHEREemployee_id=180;
正确答案:A
答案解析:
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