查詢查找重複與價值

Question

select (a.rowindx) rowindx, (b.rowindx) rowindx1 
from dedupinitial a, 
    dedupinitial b 
where a.rowindx < b.rowindx 
and a.poivalue = b.poivalue 
order by a.rowindx; 

複製該查詢給我造成像

rowindx rowindx1 
945 88715 
945 91674 
945 90947 
945 91013 
88715 91674 
88715 90947 
88715 91013 

但我想導致這樣的：

rowindx rowindx1 

    945 88715 
    945 91674 
    945 90947 
    945 91013 

什麼是查詢FOT是什麼？

Answer 1

你只需要一分鐘（第一列），以及一組由（第二列）

select min(a.rowindx)rowindx, b.rowindx rowindx1 
from dedupinitial a, 
dedupinitial b 
where a.rowindx < b.rowindx --and a.rowindx 
and a.poivalue = b.poivalue 
group by b.rowindx 
order by 1; 

PS：我不理解和a.rowindx部分