sql - 组合/折叠行与 group_by + 以列为下一行的条件
问题描述
我所拥有的是一家电信公司与新客户签约的聊天记录。在聊天中,客户和公司代表进行了聊天。
我正在尝试折叠聊天,以减少行数。下图显示了之前数据的外观以及之后数据的外观。
前
后
我看过以下文章:
我试过这段代码:
select
unique_id, string_agg(concat(text, ' ', text), ', ')
from
conversation
group by
unique_id, user
但是,这不会根据需要折叠它。它将其完全折叠为 2 行,一条用于客户,另一条用于公司。我正在寻找的逻辑是如果此查询中的下一行包含相同的 unique_id,则用户将当前行文本字段与下一行文本字段连接起来。
这是 SQL Fiddle 页面,但我在 SQL Server 中运行此代码string_agg
:http ://sqlfiddle.com/#!9/5ad86c/3
如果您查看我的 StackOverflow 历史记录,我已经在 R 中请求了一个几乎类似的算法。
CREATE TABLE conversation
(
`unique_id` double,
`line_no` int,
`user` varchar(7000),
`text` varchar(7000)
);
INSERT INTO conversation (`unique_id`, `line_no`, `user`, `text`)
VALUES
(50314585222, 1, 'customer', 'Hi I would like to sign up for a service'),
(50314585222, 2, 'company', 'Hi My name is Alex. We can offer the following plans. We also have signup bonuses, with doubling of data for 12 months '),
(50314585222, 3, 'company', 'Plan1: 40GB data, with monthly price of $80'),
(50314585222, 4, 'company', 'Plan2: 20GB data, with monthly price of $40'),
(50314585222, 5, 'company', 'Plan3: 5GB data, with monthly price of $15'),
(50314585222, 6, 'customer', 'I was hoping for a much smaller plan, with only voice service'),
(50314585222, 7, 'customer', 'maybe the $10 per month plan.'),
(50319875222, 4, 'customer', 'so how do I sign up'),
(50319875222, 5, 'customer', '*for the service'),
(50319875222, 7, 'company', 'maybe I can call you for your details?')
;
解决方案
如果我对您的理解正确,则下一种方法是一种可能的解决方案。您需要找到更改并定义适当的组:
桌子:
CREATE TABLE [conversation]
(
[unique_id] bigint,
[line_no] int,
[user] varchar(7000),
[text] varchar(7000)
);
INSERT INTO [conversation] ([unique_id], [line_no], [user], [text])
VALUES
(50314585222, 1, 'customer', 'Hi I would like to sign up for a service'),
(50314585222, 2, 'company', 'Hi My name is Alex. We can offer the following plans. We also have signup bonuses, with doubling of data for 12 months '),
(50314585222, 3, 'company', 'Plan1: 40GB data, with monthly price of $80'),
(50314585222, 4, 'company', 'Plan2: 20GB data, with monthly price of $40'),
(50314585222, 5, 'company', 'Plan3: 5GB data, with monthly price of $15'),
(50314585222, 6, 'customer', 'I was hoping for a much smaller plan, with only voice service'),
(50314585222, 7, 'customer', 'maybe the $10 per month plan.'),
(50319875222, 4, 'customer', 'so how do I sign up'),
(50319875222, 5, 'customer', '*for the service'),
(50319875222, 7, 'company', 'maybe I can call you for your details?')
;
陈述:
; WITH ChangesCTE AS (
SELECT
*,
LAG([user]) OVER (PARTITION BY [unique_id] ORDER BY [line_no]) AS prev_user
FROM [conversation]
), GroupsCTE AS (
SELECT
*,
SUM(CASE WHEN [user] <> [prev_user] OR [prev_user] IS NULL THEN 1 ELSE 0 END) OVER (PARTITION BY [unique_id] ORDER BY [line_no]) AS [group_id]
FROM ChangesCTE
)
SELECT
[unique_id],
MIN([line_no]) AS [line_no],
MIN([user]) AS [user],
STRING_AGG([text], ' ') WITHIN GROUP (ORDER BY [line_no]) AS [text]
FROM GroupsCTE
GROUP BY [unique_id], [group_id]
ORDER BY [unique_id]
结果:
unique_id line_no user text
50314585222 1 customer Hi I would like to sign up for a service
50314585222 2 company Hi My name is Alex. We can offer the following plans. We also have signup bonuses, with doubling of data for 12 months Plan1: 40GB data, with monthly price of $80 Plan2: 20GB data, with monthly price of $40 Plan3: 5GB data, with monthly price of $15
50314585222 6 customer I was hoping for a much smaller plan, with only voice service maybe the $10 per month plan.
50319875222 4 customer so how do I sign up *for the service
50319875222 7 company maybe I can call you for your details?
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