多项选择题

Which two statements are true regarding the default behavior of the ORDER BY clause? （）

A.Null values are left out of the sort.
B.Character values are displayed from Z to A
C.Date values are displayed with the earliest value first.
D.Null values are displayed last for descending sequences.
E.Numeric values are displayed with the lowest values first.

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Which are DML statements? （）

A.COMMIT
B.MERGE
C.UPDATE
D.DELETE
E.CREATE
F.DROP...

单项选择题

Click the Exhibit button and examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name
FROM employees
WHERE salary IN (SELECT MAX(salary)
FROM employees
GROUP BY department_id);
Which statement is true?（）

A.The SELECT statement is syntactically accurate.
B.The SELECT statement does not work because there is no HAVING clause.
C.The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.
D.The SELECT statement does not work because the GROUP BY clause should be in the main query and not in the subquery.

多项选择题

Which two are character manipulation functions? （）

A.TRIM
B.REPLACE
C.TRUNC
D.TO_DATE
E.MOD
F.CASE