单项选择题
The EMP table contains these columns: EMPLOYEE_ID NUMBER(4) EMPNAME VARCHAR2 (25) SALARY NUMBER(9,2) HIRE_DATE DATE You query the database with this SQL statement: SELECT empname,hire_date HIREDATE, salary FROM EMP ORDER BY hire_date; How will the results be sorted?（）
A.randomly B.ascending by date C.descending by date D.ascending alphabetically E.descending alphabetically
单项选择题 Which is an iSQL*Plus command?（）
单项选择题 Which iSQL*Plus feature can be used to replace values in the WHERE clause?（）
多项选择题 Which four statements correctly describe functions that are available in SQL? （）
