如何在 MySQL 中连接一组结果？
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时间：2020-08-31 14:30:15 来源:igfitidea点击:
How can I concatenate set of results in MySQL?
提问by dusoft
I would like to join results returned in the set in MySQL with a comma as a separator string.
我想用逗号作为分隔符字符串加入 MySQL 集合中返回的结果。
For example, set returned contains:
例如，返回的集合包含：
COLUMN_X
john
jerry
maria
joseph
gugla
I would like to receive the result as:
我希望得到的结果是：
COLUMN_X-concat
john,jerry,maria,joseph,gugla
is that possible? thanks.
那可能吗？谢谢。
SELECT CONCAT(rooms.ID,",") FROM rooms AS rooms LEFT JOIN inter AS i ON rooms.ID=i.value WHERE xxx=999
doesn't work as I would like it to as it returns separate results.
不能像我希望的那样工作，因为它返回单独的结果。
回答by Stefan Gehrig
SELECT GROUP_CONCAT(COLUMN_X SEPARATOR ',') FROM <<table>> GROUP BY NULL
See GROUP_CONCAT.
