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Select bigger string from 2 or more strings in a column

Posted on 2009-06-27
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Last Modified: 2012-05-07
I want to make a group seletc that retrieves a distinct string from col1 and the larger string from col2.....
ex.
[col1]           [col2 ]  [col3]
1111          aaa        3
2222          bbb         3
1111          ccccc     5
2222          ddddd     5
3333          eeee       4
3333          f              1

results wanted!!
[col1]   [col2]  
1111    ccccc
2222    ddddd  
3333    eeee

col1 and col3 are string , col3 int with the length of the string in col2.....
i made several mysql query and sometimes retrieves the larger string, others not.

i know how to do this with php but i want to doit in a mysql query, maybe i need a sub query...
Thanks.
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Comment
Question by:dmonzon
8 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 63 total points
ID: 24729128
what version of mysql?

let's try this:
select t.*
  from yourtable t
 where len(col2) = ( SELECT max(len(i.col2)) from yourtable i where i.col1 = t.col1 )

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LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 24729129
SELECT Col1, MAX(Col2)Col2
FROM urTable
GROUP BY Col1
0
 
LVL 41

Expert Comment

by:ralmada
ID: 24729183
I think you're looking for this:
select a.col1, a.col2
from yourtable a
join (select col1, max(col3) as mcol3 from yourtable group by col1) b on a.col1 = b.col1 and a.col3 = b.mcol3

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Assisted Solution

by:awking00
awking00 earned 62 total points
ID: 24736780
See attached.
select col1, col2
from yourtable y,
(select col1, max(len(col2)) col2_len
 from yourtable
 group by col1) x
where y.col1 = x.col1
  and len(y.col2) = x.col2_len;

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Author Comment

by:dmonzon
ID: 24786500
sorry for the delay, i already resolve this the same day and i forgot to close the question, any way i will try your answers and let you know .....
thanks
0
 
LVL 41

Expert Comment

by:ralmada
ID: 25039499
Angel, Not sure why my query will not help the asker. Can you please advise?
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