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这篇文章主要介绍“LISTAGG函数怎么使用”，在日常操作中，相信很多人在LISTAGG函数怎么使用问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”LISTAGG函数怎么使用”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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LISTAGG函數 Oracle 11.2之後推出的：字符串聚合
字符串聚合就是按照分组把多行数据串联成一行，以下面的结果集为例：
11.2之前有WMSYS.WM_CONCAT函數，不過是非文檔說明的
舉個列子
為實現，同一類不同行數據 在 一行中顯示出來，可以使用
wmsys.wm_concat(a.FAILURE_DESC||'-'|| a.FAILURE_QTY)
或
LISTAGG(a.FAILURE_DESC||'-'|| a.FAILURE_QTY)WITHIN GROUP(ORDER BY NULL)
select a.shift, a.work_order, a.machineid, a.date_work, a.part_name, a.model_name,a.CUSTOMER_NAME,
a.model_serial, a.QTY,TO_CHAR(wmsys.wm_concat(a.FAILURE_DESC||'-'|| a.FAILURE_QTY))from (
SELECT a.shift, a.work_order, a.machineid, a.date_work, a.part_name, a.model_name,a.CUSTOMER_NAME,
a.model_serial, SUM (a.pass_qty) QTY,b.FAILURE_DESC,b.FAILURE_QTY
FROM (SELECT a.shift, a.work_order, a.machineid,c.CUSTOMER_NAME,
CASE WHEN a.shift = 'N' AND a.time_section <8
THEN TO_CHAR (TO_DATE (a.work_date, 'yyyy/mm/dd') - 1,'yyyymmdd')
ELSE a.work_date
END AS date_work,
a.pass_qty, b.part_name, a.model_name, b.model_serial
FROM (SELECT work_date, work_order, machineid, model_name,
CASE WHEN time_section > 8
AND time_section <=20
THEN 'D'
ELSE 'N'
END shift,time_section, pass_qty
FROM wip_d_machine_uph) a,mms.bdm_s_product b,BDM_S_CUSTOMER c
WHERE a.model_name = b.part_no and b.CUSTOMER_ID = c.CUSTOMER_ID)a,
(select a.*,
CASE WHEN time_section > 8 AND time_section <= 20
THEN 'D'
ELSE 'N'
END shift ,
CASE WHEN time_section > 8
AND time_section<= 20
THEN to_char(FAILURE_INIPUT_TIME,'yyyymmdd')
ELSE to_char(FAILURE_INIPUT_TIME-1,'yyyymmdd')
END work_date
from OEE_D_FAILURE_INPUT a) b
where a.WORK_ORDER = b.WORK_ORDER(+)
and a.model_name = b.PART_NO(+)
and a.MACHINEID = b.MACHINE_ID(+)
and a.DATE_WORK = b.work_date(+)
and a.shift=b.shift(+)
and a.DATE_WORK>='20130101' and a.DATE_WORK<='20130203' and a.CUSTOMER_NAME ='DELL'
GROUP BY a.shift,a.work_order,a.machineid,a.date_work,a.part_name,a.model_name,a.model_serial,a.CUSTOMER_NAME,b.FAILURE_DESC,b.FAILURE_QTY) a
GROUP BY a.shift,a.work_order,a.machineid,a.date_work,a.part_name,a.model_name,a.qty,a.model_serial,a.CUSTOMER_NAME
到此，关于“LISTAGG函数怎么使用”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注创新互联网站，小编会继续努力为大家带来更多实用的文章！
