SQL select查询以合并行

Question

我有一个MySQL数据库：

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Email                 | Name                      | Tag
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test@test.com         |Test Person               | TagOne
test@test.com         |Test Person               | Tag Two
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需要返回的SQL查询

-------------------------------------------------------------------
Email                 | Name                      | Tag
-------------------------------------------------------------------
test@test.com         |Test Person               | TagOne, Tag Two
-------------------------------------------------------------------

我该怎么做？

Answer 1

使用：

  SELECT t.email,
         t.name,
         GROUP_CONCAT(DISTINCT t.tag ORDER BY t.tag SEPARATOR ', ')
    FROM YOUR_TABLE t
GROUP BY t.email, t.name

参考：

• GROUP_CONCAT

Answer 2

对于其他任何试图这样做并被卡住的人：

SELECT Email, Name, GROUP_CONCAT(Tag ORDER BY Tag ASC SEPARATOR ', ')
FROM Table
GROUP BY Email