将多行合并为一列中具有多个行值的行 [英] Merge multiple rows into one with more than one row value in a column
问题描述
我目前正在构建一个查询以从我的数据库中检索一些数据,我需要在一行中访问一些具有公共 ID 的信息.
I'm currently building a query to retrieve some data from my db, I need to access some information with a common id in just one row.
使用此查询:
select
missions_answer.response_id as "response",
crm_player."document" as "document",
missions_question.label as "label",
missions_answertext.body as "bill #",
missions_answerselectmultiple.body as "product",
missions_answerinteger.body as "answer"
from missions_answer
left join missions_question on missions_answer.question_id = missions_question.id
left join missions_answertext on missions_answer.id = missions_answertext.answer_ptr_id
left join missions_answerselectmultiple on missions_answer.id = missions_answerselectmultiple.answer_ptr_id
left join missions_answerinteger on missions_answer.id = missions_answerinteger.answer_ptr_id
left join missions_response on missions_answer.response_id = missions_response.id
left join crm_player on missions_response.player_id = crm_player.id
LEFT JOIN crm_user ON crm_player.user_id = crm_user.id
where missions_answer.response_id = '71788176'
group by missions_answer.response_id, crm_player.document,missions_answertext.body,
missions_question.label,
missions_answerselectmultiple.body ,
missions_answerinteger.body,
crm_user.first_name,
crm_user.last_name
这是我目前拥有的:
+ response + document + label + bill # + product + answer
- 71788176 - 79907201 - bill # - 26899 - -
- 71788176 - 79907201 - amount - - - 1
- 71788176 - 79907201 - product - - {"name": "Shoes"} -
- 71788176 - 79907201 - price - - - 25.99
这就是我要找的:
+ response + document + bill # + product + amount + price
- 71788176 - 79907201 - 26899 - shoes - 1 - 25.99
我一直在尝试使用 crosstab
但我仍然找不到它,在此先感谢您提供任何提示或帮助.
I've been trying to use crosstab
but I'm still unable to find it, thanks in advance for any hint or help.
推荐答案
根据您当前的状态,您只需使用 FILTER
子句即可进行透视:
From your current state you simply can do the pivot using the FILTER
clause:
SELECT
response,
document,
MAX(bill) FILTER (WHERE label = 'bill') as bill,
MAX(answer) FILTER (WHERE label = 'amount') as amount,
MAX(product) FILTER (WHERE label = 'product') as product,
MAX(answer) FILTER (WHERE label = 'price') as price
FROM t
GROUP BY response, document
我不太确定,你原来的桌子是什么样子的.如果更像这样:
I am not quite sure, how your original table looks like. If it is more like this:
response | document | label | value
-------: | -------: | :------ | :----
71788176 | 79907201 | bill | 26899
71788176 | 79907201 | amount | 1
71788176 | 79907201 | product | shoes
71788176 | 79907201 | price | 25.99
然后你可以像这样修改查询:
Then you can modify the query like this:
SELECT
response,
document,
MAX(value) FILTER (WHERE label = 'bill') as bill,
MAX(value) FILTER (WHERE label = 'amount') as amount,
MAX(value) FILTER (WHERE label = 'product') as product,
MAX(value) FILTER (WHERE label = 'price') as price
FROM t
GROUP BY response, document
编辑:将 JSON 值添加到产品列:
Edit: TO added the JSON value to product column:
变体 1:您可以简单地将 json
类型转换为 text
类型:
Variant 1: You could simply cast the type json
into type text
:
MAX(product::text) FILTER (WHERE label = 'product') as product,
变体 2:您从 name"
属性中读取值:
Variant 2: You read the value from the "name"
attribute:
MAX(product ->> 'name') FILTER (WHERE label = 'product') as product,
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