Maulana iman :
So I have this data, from tbl_left :
id name type our_assets
1 'Mira' cc 10
2 'Mira' bb 9
And this one, from tbl_right :
id name assets_other name_of_assets
1 'Mira' 3 assets_a
2 'Mira' 1 assets_b
3 'Mira' 1 assets_c
4 'Mira' 1 assets_d
How can I join the both table and result something like this :
name type our_assets assets_other name_of_assets
'Mira' cc 10 3 assets_a
'Mira' bb 9 1 assets_b
'Mira' 1 assets_c
'Mira' 1 assets_d
I don't care if the column type and our_assets have duplicate value, I've tried using join but the result become 8 rows instead of 4 like :
name type our_assets assets_other name_of_assets
'Mira' cc 10 3 assets_a
'Mira' cc 10 3 assets_a
'Mira' bb 9 1 assets_b
'Mira' bb 9 1 assets_b
'Mira' 1 assets_c
'Mira' 1 assets_c
'Mira' 1 assets_d
'Mira' 1 assets_d
If I use group by name_of_assets the column type only return the "cc" value.
GMB :
You need to add another join criteria than the name to avoid duplicating the records. One option uses row_number() (available in MySQL 8.0):
select r.name, l.type, l.our_assets, r.assets_other, r.name_of_asset
from (select r.*, row_number() over(partition by name order by id) rn from tbl_right) l
left join (select l.*, row_number() over(partition by name order by id) rn from tbl_left) r
on r.name = l.name and r.rn = l.rn
If records may be missing on both ends of the join, you can use union all and aggregation instead:
select
name,
max(type) type,
amx(our_assets) our_assets,
max(assets_other) assets_other,
max(name_of_asset) name_of_asset
from (
select
name,
type,
our_assets,
null assets_other,
null name_of_asset,
row_number() over(partition by name order by id) rn
from tbl_left
union all
select
name,
null,
null,
assets_other,
name_of_asset,
row_number() over(partition by name order by id) rn
from tbl_right
) t
group by name, rn
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