我有一個小問題,以下查詢。它返回多個值。重複值與group_concat和連接
這是我收到的結果:
+----+--------------+--------+--------+---------------------+----------+------------------+
| id | company | county | vm | os | products | sn |
+----+--------------+--------+--------+---------------------+----------+------------------+
| 1 | ABC Corp | USA | VMW | Linux, Linux, Linux | 3 | A123, B234, A343 |
| 2 | DEF Corp | USA | CIT | Windows | 1 | I223 |
+----+--------------+--------+--------+---------------------+----------+------------------+
正如你可以看到,第一行顯示3倍的Linux,但這應該只列出一次。我已經看到,如果客戶擁有超過1種產品,則只會出現此問題。我想我必須將我的查詢或類似的東西分組,但我不知道如何。
這裏是我的查詢:
SELECT
customer.id,
customer.company,
countries.en AS country,
vmenv.name AS vm,
GROUP_CONCAT(operatingsystems.name SEPARATOR ', ') AS os,
COUNT(device2customer.sn) AS products,
GROUP_CONCAT(device2customer.sn SEPARATOR ', ') AS sn
FROM
customer
LEFT JOIN
countries
ON
customer.country = countries.id
LEFT JOIN
vmenv2kunden
ON
vmenv2kunden.customerid = customer.id
LEFT JOIN
vmenv
ON
vmenv2kunden.vmenvnr = vmenv.id
LEFT JOIN
operatingsystems2customer
ON
operatingsystems2customer.customerid = customer.id
LEFT JOIN
operatingsystems
ON
operatingsystems2customer.osnr = operatingsystems.id
LEFT JOIN
device2customer
ON
device2customer.kundenid = customer.id
GROUP BY
customer.id
DISTINCT也許工作? – Strawberry