Oracle SQL函数listagg实现多行字符串连接

listagg 函数将组内的数据通过 order by 排序后，再连接到一起，可以指定分隔符。输入多行，输出一行或多行。常用来将值连接成逗号分隔的数据。

语法：

三个使用场景：

• As a single-set aggregate function, LISTAGG operates on all rows and returns a single output row.

• As a group-set aggregate, the function operates on and returns an output row for each group defined by theGROUPBY clause.

• As an analytic function, LISTAGG partitions the query result set into groups based on one or more expression in thequery_partition_clause.

场景2，根据 group by 子句的分组情况，每组返回一行；

场景3，作为分析函数，根据 query_partition_clause 子句的分组情况，每行返回一行（同组内的每行返回值可能是一样的）。

分别对应以上场景的例子：

场景1：

SELECT LISTAGG(last_name, '; ')WITHIN GROUP (ORDER BY hire_date, last_name) "Emp_list",MIN(hire_date) "Earliest"FROM employeesWHERE department_id = 30;Emp_list                                                     Earliest
------------------------------------------------------------ ---------
Raphaely; Khoo; Tobias; Baida; Himuro; Colmenares            07-DEC-02

场景2：

SELECT department_id "Dept.",LISTAGG(last_name, '; ') WITHIN GROUP (ORDER BY hire_date) "Employees"FROM employeesGROUP BY department_idORDER BY department_id;Dept. Employees
------ ------------------------------------------------------------10 Whalen20 Hartstein; Fay30 Raphaely; Khoo; Tobias; Baida; Himuro; Colmenares40 Mavris50 Kaufling; Ladwig; Rajs; Sarchand; Bell; Mallin; Weiss; Davies; Marlow; Bull; Everett; Fripp; Chung; Nayer; Dilly; Bissot; Vollman; Stiles; Atkinson; Taylor; Seo; Fleaur; Matos; Patel; Walsh; Feeney; Dellinger; McCain; Vargas; Gates; Rogers;Mikkilineni; Landry; Cabrio; Jones; Olson; OConnell; Sullivan; Mourgos; Gee; Perkins; Grant; Geoni; Philtanker; Markle60 Austin; Hunold; Pataballa; Lorentz; Ernst70 Baer
. . .

场景3：

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 employeesWHERE hire_date < '01-SEP-2003'ORDER BY "Dept", "Date", "Name";Dept Date      Name            Emp_list
----- --------- --------------- ---------------------------------------------30 07-DEC-02 Raphaely        Raphaely; Khoo30 18-MAY-03 Khoo            Raphaely; Khoo40 07-JUN-02 Mavris          Mavris50 01-MAY-03 Kaufling        Kaufling; Ladwig50 14-JUL-03 Ladwig          Kaufling; Ladwig70 07-JUN-02 Baer            Baer90 13-JAN-01 De Haan         De Haan; King90 17-JUN-03 King            De Haan; King100 16-AUG-02 Faviet          Faviet; Greenberg100 17-AUG-02 Greenberg       Faviet; Greenberg110 07-JUN-02 Gietz           Gietz; Higgins110 07-JUN-02 Higgins         Gietz; Higgins

总结：知道了怎么连接多行字符串，还需要知道怎么拆分多行字符串，请看这篇文章：

http://blog.csdn.net/seandba/article/details/72669074

以上内容均是参考Oracle 11g官方文档

Oracle® Database SQL Language Reference
11g Release 2 (11.2)
E26088-03