SQL to retrieve min value of the combination

[Ravindra Harve]

Hi,

I have the following table

1001 2 3
1001 3 5
1001 5 7
1002 5 4
1002 6 2

I need to get a result

1001 2 3
1002 6 2

How is it possible ?

[Mark C. Stock]

Re: SQL to retrieve min value of the combination

question's a little vague, but assuming you are trying to get records for
the minimum values of the first and third column, for all rows in a table,
you could try a subquery like

select *
from x
where (col1, col3) in (
select col1, min(col3)
from x
group by col1
)

but don't try this until you understand why it works ;-)

-- mcs


"Ravindra Harve" <rharve@hotmail .comwrote in message
news:835dd0ad.0 401070930.575a2 5ba@posting.goo gle.com...
| Hi,
|
| I have the following table
|
| 1001 2 3
| 1001 3 5
| 1001 5 7
| 1002 5 4
| 1002 6 2
|
| I need to get a result
|
| 1001 2 3
| 1002 6 2
|
| How is it possible ?

[Julia Sats]

Re: SQL to retrieve min value of the combination

Use this one , the same but easier
select *
from (
select col1, min(col3)
from x
group by col1
)

"Mark C. Stock" <mcstockX@Xenqu ery .comwrote in message
news:D_6dneS_Lc PC0WGiRVn-jg@comcast.com. ..

question's a little vague, but assuming you are trying to get records for
the minimum values of the first and third column, for all rows in a table,
you could try a subquery like
>
select *
from x
where (col1, col3) in (
select col1, min(col3)
from x
group by col1
)
>
but don't try this until you understand why it works ;-)
>
-- mcs
>
>
"Ravindra Harve" <rharve@hotmail .comwrote in message
news:835dd0ad.0 401070930.575a2 5ba@posting.goo gle.com...
| Hi,
|
| I have the following table
|
| 1001 2 3
| 1001 3 5
| 1001 5 7
| 1002 5 4
| 1002 6 2
|
| I need to get a result
|
| 1001 2 3
| 1002 6 2
|
| How is it possible ?
>
>

[Mark C. Stock]

Re: SQL to retrieve min value of the combination

Julia,

Not the same by any means.

Your select * does absolutely nothing -- the subquery results are simply
passed thru unchanged

Your subquery contains only two columns -- the assumption is that all
columns should be displayed

Try them both on the EMP table with the empno, deptno, and sal in the
resultset and dept and sal in the subquery ("Write a report that lists the
lowest paid employees in each department")

-- mcs

"Julia Sats" <julia.sats@sym patico.cawrote in message
news:iKnLb.7982 2$BA6.1688941@n ews20.bellgloba l.com...
| Use this one , the same but easier
| select *
| from (
| select col1, min(col3)
| from x
| group by col1
| )
|
| "Mark C. Stock" <mcstockX@Xenqu ery .comwrote in message
| news:D_6dneS_Lc PC0WGiRVn-jg@comcast.com. ..
| question's a little vague, but assuming you are trying to get records
for
| the minimum values of the first and third column, for all rows in a
table,
| you could try a subquery like
| >
| select *
| from x
| where (col1, col3) in (
| select col1, min(col3)
| from x
| group by col1
| )
| >
| but don't try this until you understand why it works ;-)
| >
| -- mcs
| >
| >
| "Ravindra Harve" <rharve@hotmail .comwrote in message
| news:835dd0ad.0 401070930.575a2 5ba@posting.goo gle.com...
| | Hi,
| |
| | I have the following table
| |
| | 1001 2 3
| | 1001 3 5
| | 1001 5 7
| | 1002 5 4
| | 1002 6 2
| |
| | I need to get a result
| |
| | 1001 2 3
| | 1002 6 2
| |
| | How is it possible ?
| >
| >
|
|