题目内容

编制会计报表是企业账务处理程序的组成部分。

A. 正确
B. 错误

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Examine the description of the EMPLOYEES table: EMP_ID NUMBER(4) NOT NULL LAST_NAME VARCHAR2(30) NOT NULL FIRST_NAME VARCHAR2(30) DEPT_ID NUMBER(2) Which statement produces the number of different departments that have employees with last name Smith?（）

A. SELECT COUNT(*) FROM employees WHERE last_name='Smith';
B. SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith';
C. SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith';
D. SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith';
E. SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith'

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