mysql:如何将行数据放入一个返回列

Question

我不确定如何提出这个问题,或者搜索/谷歌的"关键字"是什么.我在这里有什么

=========================
=   ID   =   Running#   =
=========================
=   A    =      3       =
=   A    =      4       =
=   A    =      5       =
=   E    =      6       =
=   E    =      3       =
=   G    =      4       =
=   G    =      7       =
=   T    =      3       =
=========================

我希望在一个字符串中获得A,E,T这样的返回,它们运行#3

谢谢

Answer 1

你需要使用GROUP_CONCAT这个,

SELECT GROUP_CONCAT(ID)
FROM tablename
Where Running = 3