Question

I have a PL/SQL select query like,

select 
    a.sgm,
    b.numbr 
from tbl1 a, tbl2 b 
where b.itemId = a.itemId 
    and b.orgId = a.orgId 
    and a.srvCode = 'F' 
    and a.nbrCode <> 1 
    and rownum <= 7

Right now it retrieves like ,

sgm-|-numbr 
-----------
abc-|-123
abc-|-678
abc-|-78
abc-|-099
bcd-|-153
bcd-|-123
bcd-|-123

I need to retrieve like ,

sgm-|-numbr 
-----------
abc-|-123
bcd-|-153

ie, I need to remove the repeated ones in the first column. ie sgm shouldn’t repeat.

Answer 1

Since you are using Oracle, then try this simplified version using a CTE:

WITH CTE as (
  SELECT sgm, numbr, 
      rownum rn
    FROM YourTable 
    )

SELECT CTE.sgm, CTE.numbr
FROM CTE
JOIN (
  SELECT sgm,  MIN(rownum) minrn
  FROM CTE
  GROUP BY sgm) t ON CTE.sgm = t.sgm AND CTE.rn = t.minrn  

http://sqlfiddle.com/#!4/8d6fb/10

You can replace your query in the CTE above.

Good luck.