Database Discussion Boards

Colin Angus Mackay15-Jul-07 23:33

15-Jul-07 23:33

PrakashBhaskar wrote:
for this you have to use corolated queries following the example

SELECT sno, name, desc FROM <table name> WHERE sno=(SELECT MAX(sno) FROM <table mame)

I think ur problem has solved

That will return the row "8 suma jsakdksladksadks" only.

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Re: how to write query

PrakashBhaskar15-Jul-07 23:39

PrakashBhaskar

15-Jul-07 23:39

i am sorry i have mis-understood the question

Thanks
Warm Regards
Prakash-B

Re: how to write query

Dipti D Jadhav16-Jul-07 0:15

Dipti D Jadhav

16-Jul-07 0:15

You can use following query

select max(no),name from trial1
group by name

If have any questions, thn let me know

Re: how to write query

Colin Angus Mackay16-Jul-07 0:47

Colin Angus Mackay

16-Jul-07 0:47

d_d_jadhav wrote:
You can use following query

select max(no),name from trial1
group by name

If have any questions, thn let me know

No, that will result in:

8 suma

only. Which does not match the output the OP requested.

Re: how to write query

Dipti D Jadhav16-Jul-07 0:16

Dipti D Jadhav

16-Jul-07 0:16

You can use following query

select max(no),name from trial1
group by name

If have any questions, thn let me know

Dipti Jadhav

Re: how to write query

Sathesh Sakthivel16-Jul-07 1:08

Sathesh Sakthivel

16-Jul-07 1:08

One post is enough.

Regards,

Satips. Rose | [Rose]

Don't walk in front of me, I may not follow;
Don't walk behind me, I may not lead;
Walk beside me, and just be my friend. - Albert Camus

Re: how to write query

Dipti D Jadhav16-Jul-07 19:03

Dipti D Jadhav

16-Jul-07 19:03

The answer for ur question is here

select sno,name,[desc] from trial1
where convert(varchar(50),sno)+name in(select convert(varchar(50),max(sno))+name from trial1
group by name)

Please let me know, if u have any questions/comments.

displaying a data in textbox

Rharzkie15-Jul-07 22:57

Rharzkie

15-Jul-07 22:57

Its me again, i making a grade data entry. I have a database of diffenrent subjects. The fields that i will going to use is these: Subject code, Subject description, and professor.

What I want is to view the subject description and the professor in the textboxes when I select a subject code in the combo box.

I had already made an OleDbDataAdapter for that, and the subject codes was the data member in the combobox. The subject codes is already the item of the combobox but my problem is, the subject description and professor was not appeared in the textbox. What I want is this to view to its corresponding textboxes.

I used this code:

For ctr = 0 To DataSet31.studentsubjects.Rows.Count - 1<br />
            dr = DataSet31.studentsubjects.Rows(ctr)<br />
            If ComboBox1.SelectedItem = dr("subject") Then<br />
                subjdesc.Text = dr("subjdesc")<br />
                prof.Text = dr("professor")<br />
            End If<br />
        Next

Is the code above correct??? If its not, what is the right code????

Where will I going to put the codes???

Re: displaying a data in textbox

Colin Angus Mackay15-Jul-07 23:28

Colin Angus Mackay

15-Jul-07 23:28

Rharzkie wrote:
ComboBox1

Can you please name your variables with good names rather than accept the defaults that Visual Studio gives you.

Rharzkie wrote:
ComboBox1.SelectedItem = dr("subject")

What does ComboBox1.SelectedItem return? Put a break point down and see what value it is returning. Also it will aid the debugging process if you assign the result of method and property calls to something then test on the local variables - it will make it easier to see what is going on in the debugger.

Re: displaying a data in textbox

Rharzkie15-Jul-07 23:59

Rharzkie

15-Jul-07 23:59

The ComboBox1 is for the list of the subject code. I use the DISTINCT in query builder to display the items in the combobox. I use the OleDbDataAdapter1 for that.

But the connection that i will going to display in textbox is OleDbDataAdapter3. In short, i use different connection from the combobox and the textboxes. Is this correct?

Re: displaying a data in textbox

Colin Angus Mackay16-Jul-07 0:53

Colin Angus Mackay

16-Jul-07 0:53

Rharzkie wrote:
The ComboBox1 is for the list of the subject code.

Yes, but ComboBox1 still isn't a good name for it, is it?

Rharzkie wrote:
OleDbDataAdapter1

Rharzkie wrote:
OleDbDataAdapter3

How do you keep track of what each of these does?

Rharzkie wrote:
Is this correct?

I have no idea. This code is obviously a mess. My suggestion is to start by naming things properly. Then it might be an idea to create a DAL and remove all your database interaction out of the user interface classes. It might also be an idea to do what I asked in my previous post and answer the question I asked. ("What does ComboBox1.SelectedItem return?" - And I want actual values and object types, not what you think it should return)

Date format in cell

Sam Heller15-Jul-07 22:19

Sam Heller

15-Jul-07 22:19

I currently have an app up and running in .NET. We have just built the server for the app to run on but there seems to be a problem with some of the returned date formats within the app itself. I checked the original test db and the date format was english style 31/12/2007 but on the new database it was amercian style 12/31/2007. Is there a setting in SQL server 2005 that would aler this?

Re: Date format in cell

Colin Angus Mackay15-Jul-07 23:35

Colin Angus Mackay

15-Jul-07 23:35

Dates are not stored any any locale dependent format. When you get data out the database you should get a DateTime object which you can then format as you need with ToString()

e.g. myDate.ToString("dd/MM/yyyy")

Query for finding number of columns in a table?

Mushtaque Nizamani15-Jul-07 20:41

Mushtaque Nizamani

15-Jul-07 20:41

Hi,
Is there any query through which i can get the number of columns in a table.

Best Regards,
Mushq

Mushtaque Ahmed Nizamani
Software Engineer
Ultimus Pakistan

"English is my second language, so please don't mind if i do some grammatical or spelling mistakes in my messages."

Re: Query for finding number of columns in a table?

RepliCrux15-Jul-07 20:59

RepliCrux

15-Jul-07 20:59

SELECT Count(COLUMN_NAME)

FROM INFORMATION_SCHEMA.COLUMNS

WHERE TABLE_Name = 'TableName'

Need help to select max date

masyarial15-Jul-07 18:37

masyarial

15-Jul-07 18:37

I try this code, and it's work.

select name,date=max(date),
sum(case when type='A' then value else 0 end) as 'A',
sum(case when type='B' then value else 0 end) as 'B',
sum(case when type='C' then value else 0 end) as 'C'
from table1
group by name

But after few days, my database is update with more than one record in the same name, separate by column name 'date',
Regarding I just want to display data depend on last date,
Example my table is below:

name type value date
-----------------------------------------------------
a A 1 07/10/2007
a B 1 07/10/2007
a C 1 07/10/2007
a A 2 07/13/2007
a B 2 07/13/2007
a C 2 07/13/2007

but the result is:

the result is:
name date A B C
-----------------------------------------
a 06/13/2007 3 3 3

I'm expecting like this:
name date A B C
-----------------------------------------
a 06/13/2007 2 2 2

I try to modified the code:
select name,
sum(case when type='A' and date=max(date) then....
but found error

So, any suggestion, thanks a lot.

Re: Need help to select max date

Paul Conrad15-Jul-07 18:57

Paul Conrad

15-Jul-07 18:57

Have you tried:

<code>     select name,date,
         sum(case when type='A' then value else 0 end) as 'A',
         sum(case when type='B' then value else 0 end) as 'B',
         sum(case when type='C' then value else 0 end) as 'C'
     from table1 where date=max(date)
     group by name </code>

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Need help to select max date

Krish - KP15-Jul-07 19:08

Krish - KP

15-Jul-07 19:08

Are your sure and Have you checked is the query wroks.

Regards
KP

Re: Need help to select max date

Paul Conrad15-Jul-07 19:23

Paul Conrad

15-Jul-07 19:23

Krish - KP,

This one should do it. I created the same table you had, ran this one and it gives the right results Big Grin | :-D

<code>select name,max(date),
         sum(case when type='A' then value else 0 end) as 'A',
         sum(case when type='B' then value else 0 end) as 'B',
         sum(case when type='C' then value else 0 end) as 'C'
     from table_1 where date=(select max(date) from table_1)
     group by name </code>

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

Re: Need help to select max date

Krish - KP15-Jul-07 23:25

Krish - KP

15-Jul-07 23:25

Now syntax is right.

what about logic. is this what required Smile | :)

Regards
KP

Re: Need help to select max date

masyarial16-Jul-07 0:00

masyarial

16-Jul-07 0:00

About logic is OK, I already use convert.
And about your code below:

SELECT a.name, MAX(a.dt) AS [date],
SUM(CASE WHEN type = 'A' THEN valu ELSE 0 END) AS A,
SUM(CASE WHEN type = 'B' THEN valu ELSE 0 END) AS B,
SUM(CASE WHEN type = 'C' THEN valu ELSE 0 END) AS C
FROM TblB a
INNER JOIN (SELECT name, MAX(dt) AS dt FROM tblB GROUP by name) b
ON a.name = b.name and a.dt = b.dt
GROUP BY a.name

this only show each name, with maximum value
not each name, each type with maximum value.

I have been tried to modified inside inner join code but, still don't get.
Pls help mee.....

Re: Need help to select max date

Krish - KP16-Jul-07 1:36

Krish - KP

16-Jul-07 1:36

example given gives max with name. that's why in inner join table (subquery)
i've not used type.

include type also in subquery's group by clause.

Regards
KP

Re: Need help to select max date

masyarial16-Jul-07 22:03

masyarial

16-Jul-07 22:03

OK Krish, I done with your code, it's very2 work thanks.
But how I write sql syntax if I want to select another table
(for example tbl2) instead of a.tbl1 INNER JOIN b.tbl1 ???

Thanks a lot
B.regards

Re: Need help to select max date

masyarial15-Jul-07 20:31

masyarial

15-Jul-07 20:31

Hi Jonh, I have error on your code
Msg 147, Level 15, State 1, Line 1
An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list, and the column being aggregated is an outer reference.

I try to modified the code below:
select name,date,
sum(case when type='A' then value else 0 end) as 'A',
sum(case when type='B' then value else 0 end) as 'B',
sum(case when type='C' then value else 0 end) as 'C'
from table1 where date=(select max(date) from table1)
group by name

it's work but, this code will only show maximum date on whole table,
not show each name which have maximum date.

Need your suggestion. thanks

Re: Need help to select max date

Krish - KP15-Jul-07 19:09

Krish - KP

15-Jul-07 19:09

SELECT a.name, MAX(a.dt) AS [date], <br />
    SUM(CASE WHEN type = 'A' THEN valu ELSE 0 END) AS A, <br />
    SUM(CASE WHEN type = 'B' THEN valu ELSE 0 END) AS B, <br />
    SUM(CASE WHEN type = 'C' THEN valu ELSE 0 END) AS C<br />
FROM TblB a <br />
   INNER JOIN (SELECT name, MAX(dt) AS dt FROM  tblB GROUP by name) b <br />
                                 ON a.name = b.name and a.dt = b.dt<br />
GROUP BY a.name

Regards
KP

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