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查詢:意義甲骨文
SELECT department_id "Dept", hire_date "Date", last_name "Name",
LISTAGG(last_name, '; ') WITHIN GROUP (ORDER BY hire_date, last_name)
OVER (PARTITION BY department_id) as "Emp_list"
FROM employees
WHERE hire_date < '01-SEP-2003'
ORDER BY "Dept", "Date", "Name";
Dept Date Name Emp_list ----- --------- --------------- -------------------------------- 30 07-DEC-02 Raphaely Raphaely; Khoo 30 18-MAY-03 Khoo Raphaely; Khoo 40 07-JUN-02 Mavris Mavris 50 01-MAY-03 Kaufling Kaufling; Ladwig 50 14-JUL-03 Ladwig Kaufling; Ladwig 70 07-JUN-02 Baer Baer 90 13-JAN-01 De Haan De Haan; King 90 17-JUN-03 King De Haan; King 100 16-AUG-02 Faviet Faviet; Greenberg 100 17-AUG-02 Greenberg Faviet; Greenberg 110 07-JUN-02 Gietz Gietz; Higgins 110 07-JUN-02 Higgins Gietz; Higgins
的疑問: 什麼是在這裏分區的意義?