Still returns duplicate rows
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Distinct on a right/left inner join
Hi,
I've got the need to select everything from table1 and only 1 row from table2. Table2 can hold any number of rows from 0 to 10,000
I've tried the following with no joy. Any ideas?
SELECT DISTINCT (ID) AS Expr1, *
FROM aacc LEFT JOIN awardsQuery ON aacc.ID = tbl2.feildID;
This still brings back IDs that are the same!
Regards
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Answers
try this:
strSQL="SELECT DISTINCT ID FROM aacc LEFT JOIN awardsQuery ON aacc.ID = tbl2.feildID;"
set db=CurrentFB
set rst=db.Execute(strSQL)
if not (rst.eof and rst.bof) then
Do while not rst.eof
strSQL="SELECT * FROM aacc LEFT JOIN awardsQuery ON aacc.ID = tbl2.feildID AND ID = " & rst("ID") & ";"
set rst2=db.execute(strSQL)
if not (rst2.eof and rst2.bof) then
...............
'YOUR CODE HERE
end if
rst.MoveNext
Loop
end if
sorry
strSQL="SELECT DISTINCT ID FROM aacc LEFT JOIN awardsQuery ON aacc.ID = tbl2.feildID;"
set db=CurrentFB
set rst=db.Execute(strSQL)
if not (rst.eof and rst.bof) then
Do while not rst.eof
strSQL="SELECT * FROM aacc LEFT JOIN awardsQuery ON aacc.ID = tbl2.feildID AND ID = " & rst("ID") & ";"
set rst2=db.execute(strSQL)
if not (rst2.eof and rst2.bof) then
Do while not rst2.eof
'YOUR CODE HERE
..........................
rst2.Movenext
Loop
end if
rst.MoveNext
Loop
end if
There is a way to do this without any code scripting using a simple GROUP BY clause but you need to have a combination of columns in awardsQuery that are unique.
Below, I assume that you have an ID field in awardsQuery that is unique but you can do the same with a multi-columns unique key.
SELECT aacc.*, awardsQuery.*
FROM aacc
LEFT JOIN (SELECT fieldID, Min(ID) As MinID
FROM awardsQuery
GROUP BY fieldID) LowestID ON LowestID.fieldID = aacc.ID
LEFT JOIN awardsQuery on LowestID.ID = awardsQuery.ID
Please note that if aacc.ID is NOT unique you should add the DISTINCT keyword after the first SELECT
Hope this helps.
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by: 1makPosted on 2003-11-20 at 05:05:30ID: 9787010
The DISTINCT keyword acts on all of the fields returned, not just the first one (i.e. ID in your example).
If you were to explicitly name only the fields you wanted then i'm sure you'd get a better result.
e.g.
SELECT DISTINCT aacc.ID,
awardsQuery.Field1
FROM aacc
LEFT JOIN awardsQuery ON aacc.ID = awardsQuery.FieldID