[OT] Need help with SQL Query

[Ashish Kulkarni <ku...@yahoo.com>]

Hi
I have a table with 4 columns number, name, date,
time, it is not unique so can have multiple entries
for one name at different date and time.
I need to find out the first instance of name for that
number in this table, or get the name with minimum
date and time
i can do 
select min(date), min(time) from mytable where
number=123
this will give me the min date and time , but how can
i get the name also,
for example
select min(date), min(time), name from mytable
number=123
wont work

Ashish

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Re: [OT] Need help with SQL Query

[Ashish Kulkarni <ku...@yahoo.com>]

Hi
I used the following sql statement to get it working
select date, time, name from mytable
number=123 order by date, time
FETCH FIRST 1 ROWS ONLY 


--- Nathan Maves <Na...@Sun.COM> wrote:

> A little hasty with my answer...
> 
> The query I gave could give you results from two
> different rows.
> 
> Having a date and time column is problematic.  I
> would just use a  
> date column that included the time or a timestamp.
> 
> If there is only one column to worry about then you
> could do
> 
> select date, name from mytable where number = 123
> and date = (select  
> min(date) from mytable where number = 123)
> 
> nathan
> 
> 
> On Feb 24, 2006, at 9:25 AM, Nathan Maves wrote:
> 
> > You almost had it :)
> >
> > select min(date), min(time), name from mytable
> where number = 123  
> > group by name
> >
> >
> > Nathan
> >
> > On Feb 24, 2006, at 8:58 AM, Ashish Kulkarni
> wrote:
> >
> >> Hi
> >> I have a table with 4 columns number, name, date,
> >> time, it is not unique so can have multiple
> entries
> >> for one name at different date and time.
> >> I need to find out the first instance of name for
> that
> >> number in this table, or get the name with
> minimum
> >> date and time
> >> i can do
> >> select min(date), min(time) from mytable where
> >> number=123
> >> this will give me the min date and time , but how
> can
> >> i get the name also,
> >> for example
> >> select min(date), min(time), name from mytable
> >> number=123
> >> wont work
> >>
> >> Ashish
> >>
> >>
> __________________________________________________
> >> Do You Yahoo!?
> >> Tired of spam?  Yahoo! Mail has the best spam
> protection around
> >> http://mail.yahoo.com
> >
> 
> 


A$HI$H

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Re: [OT] Need help with SQL Query

[Nathan Maves <Na...@Sun.COM>]

A little hasty with my answer...

The query I gave could give you results from two different rows.

Having a date and time column is problematic.  I would just use a  
date column that included the time or a timestamp.

If there is only one column to worry about then you could do

select date, name from mytable where number = 123 and date = (select  
min(date) from mytable where number = 123)

nathan


On Feb 24, 2006, at 9:25 AM, Nathan Maves wrote:

> You almost had it :)
>
> select min(date), min(time), name from mytable where number = 123  
> group by name
>
>
> Nathan
>
> On Feb 24, 2006, at 8:58 AM, Ashish Kulkarni wrote:
>
>> Hi
>> I have a table with 4 columns number, name, date,
>> time, it is not unique so can have multiple entries
>> for one name at different date and time.
>> I need to find out the first instance of name for that
>> number in this table, or get the name with minimum
>> date and time
>> i can do
>> select min(date), min(time) from mytable where
>> number=123
>> this will give me the min date and time , but how can
>> i get the name also,
>> for example
>> select min(date), min(time), name from mytable
>> number=123
>> wont work
>>
>> Ashish
>>
>> __________________________________________________
>> Do You Yahoo!?
>> Tired of spam?  Yahoo! Mail has the best spam protection around
>> http://mail.yahoo.com
>

Re: [OT] Need help with SQL Query

[Nathan Maves <Na...@Sun.COM>]

You almost had it :)

select min(date), min(time), name from mytable where number = 123  
group by name


Nathan

On Feb 24, 2006, at 8:58 AM, Ashish Kulkarni wrote:

> Hi
> I have a table with 4 columns number, name, date,
> time, it is not unique so can have multiple entries
> for one name at different date and time.
> I need to find out the first instance of name for that
> number in this table, or get the name with minimum
> date and time
> i can do
> select min(date), min(time) from mytable where
> number=123
> this will give me the min date and time , but how can
> i get the name also,
> for example
> select min(date), min(time), name from mytable
> number=123
> wont work
>
> Ashish
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com

Re: [OT] Need help with SQL Query

[Vincent NICOLAS <vi...@teamlog.com>]

Maybe the "having" clause :
select date, time, name from mytable
having date = min(date)

Ashish Kulkarni a écrit :
> Hi
> I have a table with 4 columns number, name, date,
> time, it is not unique so can have multiple entries
> for one name at different date and time.
> I need to find out the first instance of name for that
> number in this table, or get the name with minimum
> date and time
> i can do 
> select min(date), min(time) from mytable where
> number=123
> this will give me the min date and time , but how can
> i get the name also,
> for example
> select min(date), min(time), name from mytable
> number=123
> wont work
>
> Ashish
>
>   


-- 
Vincent NICOLAS
Teamlog, Lyon

Re: [OT] Need help with SQL Query

[Jeff Butler <je...@gmail.com>]

IMHO that's a pretty poor table design - min(date) and min(time) may not
give you the exact record you want - because they are treated as unrelated.
It would be better to use a timestamp field, then do something like this:

<sql>
select name
from myTable
where number=123
 and timestamp = (select min(timestamp) from mytable where number=123)
 </sql>

Here's one way to do the query you described, but again this might not
really give you the record you want:

 <sql>
with temp (date, time) as (select min(date), min(time) from myTable where
number=123)
select name
from mytable join temp on name.date = temp.date and
 name.time = temp.time and number = 123
 </sql>

Jeff Butler


On 2/24/06, Ashish Kulkarni <ku...@yahoo.com> wrote:
>
> Hi
> I have a table with 4 columns number, name, date,
> time, it is not unique so can have multiple entries
> for one name at different date and time.
> I need to find out the first instance of name for that
> number in this table, or get the name with minimum
> date and time
> i can do
> select min(date), min(time) from mytable where
> number=123
> this will give me the min date and time , but how can
> i get the name also,
> for example
> select min(date), min(time), name from mytable
> number=123
> wont work
>
> Ashish
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>