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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,丸趣 TV 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,请跟着丸趣 TV 小编一起来学习吧!
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,请继续关注丸趣 TV 网站,丸趣 TV 小编会继续努力为大家带来更多实用的文章!