MySQL Left join 得到双重结果

Question

我的查询有问题。首先这是我的数据库结构

database mt
- mtnobuk
- mtbrg
- mtcolor
- mtloc

database mv
- mvnobuk
- mvrng
- mvmsn
- mtnobuk (FK)

这是我的数据-

MT
mtnobuk     mtbrg   mtcolor     mtloc
---------------------------------------------
MT-112      Shape    Blue       L1

MV
mvnobuk     mvrng   mvmsn       mtnobuk
-------------------------------------------------
MV-111      round   sharp       MT-112
MV-112      oval    blunt       MT-112

我只想像这样查询我的数据-

mtnobuk     mtbrg       mtcolor       mvrng         mvmsn
----------------------------------------------------------
MT-112      Shape        Blue         round         sharp
                                      oval          blunt
----------------------------------------------------------

到目前为止我已经尝试过了

SELECT  mtnobuk,mtbrg,mtcolor,mtloc,mvnobuk,mvrng,mvmsn,mtnobuk
FROM    mv
LEFT JOIN mt on mtnobuk = mvnobuk
WHERE mtnobuk = MT-112
GROUP BY mtnobuk,mtbrg

我试了很多次，结果都是双倍的，像这样

mtnobuk     mtbrg       mtcolor       mvrng         mvmsn
----------------------------------------------------------
MT-112      Shape        Blue         round         sharp
                                      oval          blunt
----------------------------------------------------------
MT-112      Shape        Blue         round         sharp
                                      oval          blunt
----------------------------------------------------------

我希望有人能帮我解决这个问题，谢谢你们，祝你们有愉快的一天。

Answer 1

我认为 GROUP CONCAT 可能是您能做的最好的。像这样尝试:

SELECT  mtnobuk, mtbrg, mtcolor, mvnobuk, GROUP_CONCAT(mvrng), GROUP_CONCAT(mvmsn)
FROM    mv
LEFT JOIN mt on mtnobuk = mvnobuk
WHERE mtnobuk = MT-112
GROUP BY mtnobuk, mtbrg, mtcolor, mvnobuk