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±í2
id names
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1 hah1
2 aa
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2 aa
3 null
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select a.id,wm_concat(b.name)
from ±í1 a,±í2 b
where a.id=b.id(+)
group by a.id
select a.id, wm_concat(name)
from table_1 a, table_2 b
where a.id = b.id(+)
group by a.id;
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