MySQL 如何将具有相同列值的mysql行分组为一行？
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How to group mysql rows with same column value into one row?
提问by jarkam
I have two tables, keywords and data.
我有两个表，关键字和数据。
Table keywords have 2 columns (id, keyword), table data have 3 columns (id[foreign key of keywords.id], name, value).
表关键字有2列（id，关键字），表数据有3列（id[keywords.id的外键]，名称，值）。
I am using this query:
我正在使用这个查询：
SELECT k.id, d.value, d.name
FROM keywords AS k
INNER JOIN data as d ON k.id = d.id
it returns something like:
它返回如下内容：
1 123 name1
1 456 name2
2 943 name1
3 542 name1
3 532 name2
3 682 name3
Each id can have values from 0 to 3 (maybe more in the future).
每个 id 的值可以从 0 到 3（将来可能会更多）。
How can I retrieve all the rows with the same id in the same row?
如何检索同一行中具有相同 id 的所有行？
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1 123 456
2 943
3 542 532 682
I want to do this because I want to be able to sort the values.
我想这样做是因为我希望能够对值进行排序。
回答by shamittomar
Use GROUP_CONCAT()like this:
GROUP_CONCAT()像这样使用：
SELECT k.id, GROUP_CONCAT(d.value)
FROM keywords AS k
INNER JOIN data as d ON k.id = d.id
GROUP BY k.id
Also, you may need to do ORDER BY d.nameto get exact order of values as you want. Like this:
此外，您可能需要根据需要ORDER BY d.name获取确切的值顺序。像这样：
SELECT k.id, GROUP_CONCAT(d.value ORDER BY d.name separator ' ')
FROM keywords AS k
INNER JOIN data as d ON k.id = d.id
GROUP BY k.id
