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You have two problems here, first off storing the city, state & country on the post table. What happens if you find you have data issues and have to move a city to another state - will require update to the post table. Second problem is performance of your query.
I would suggest three tables, Country, State, City, with city having a foreign key of state etc.
Then just keep the city location id on the post table and join to the other two tables to get your state and country.
Either that or keep the parent child relationship in location and use a CTE (common table expression) to recursively query the table to get the parent relationships for a particular location. Then just store a single location id as the foreign key on the post table. This has the possible advantage of a post being able to be logged against a country or a state instead of just a city.
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The first question is that is your indexing correctly (on all ID columns and ParentID columns).
The other question is that do you really want to retrieve all rows. You propably have somekind of where clause when you query the data. You should also build indexes to support that query.
Just a sidenote, you don't have to have 3 table. If the columns in all tables are (almost) the same, yuo can combine the data into 1 table. However, I think that's not where you should start from.
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Hi all,
i'm going to install SqlServer on Windows Vista SP1 , i will use it with Visual Studio 2008 SP1 and develop project with WPF and Linq To Sql so i will ask which is the better version of SqlServer that can be compatible/stable with VisualStudio 2008 SP1 and Vista SP1?
Thanks in anticipate.
Have a good day.
Nice Regards.
Bye
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There is no direct link between Visual Studio and Sql Server, so if you're developping something new, why not use SQL Server 2008. Visual Studio connects to SQL Server basically just as any application.
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Hi Mika,
it is my first approach to use Windows Vista SP1 with SqlServer 2008 so with my poor knowledge i ask you some advice before to make my step...i heard some news about some version of SQl Server 2005 is not compatible with Vista so i would remove this doubt from my mind.
Thanks for your support.
Nice Regards,
Bye
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Hi Mika,
the link above is useful for my doubt ,thanks  .
I will make last one question if i create a database with SqlServer 2008 this one can to be compatible with SqlServer 2005? ...example i will use the database ,create with SqlServer 2008, in SqlServer 2005 so can SqlServer 2005 read it without trouble?
Have a nice day.
Nice Regards
Bye
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ascotravel wrote: i will use the database ,create with SqlServer 2008, in SqlServer 2005 so can SqlServer 2005 read it without trouble?
I'm not sure what you mean. Do you mean backups? If you take a backup from SQL Server 2008 it cannot be read by 2005.
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Yes it mean if i can do a downgrade from SqlServer 2008 to SqlServer 2005 ...
but already you anticipate my question...
If i can do the last question : Which is the difference between SqlServer 2005 Enterprise Edition and Developer Edition?
I decide to use SqlServer 2005 because i will do backup on a machine that get SqlServer 2005.
However thanks a lot for your kind support.
Have a nice day.
best regards,
Bye
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ascotravel wrote: Which is the difference between SqlServer 2005 Enterprise Edition and Developer Edition
They have the same features but licensing is different:
"SQL Server 2005 Developer Edition allows developers to build and test any type of application with SQL Server on 32-bit, ia64, and x64 platforms. Developer Edition includes all of the functionality of Enterprise Edition, but is licensed only for development, test, and demo use"
See, SQL Server 2005 Developer Edition[^]
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HI Mika,
your information satisfy my doubt  ,
now i understand better about which version of Sql Server is right for my work.
Thanks a lot my friend.
Have a happy work.
Best Regards.
Bye 
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Hi,
I want to use audit trail for my application.In my view i shd create one new table with same structure of original table and insert old record of original table into new table at the time of update record.But how to know that there is any updation or not in this record b'cas if any user click on update button then update query will fire either you r updating record or not.
Second thing is that i have 40 fields in my table so it is not feasible to me to check for each column of that record for change.
Please suggest me way to implement audit trail in my application
N!dh!
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Create a trigger which will execute when update happens. Insert the data into audit table from this trigger.
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I am using one procedure to update main table,then one trigger to update other table affected by this table,i think updation execute bfor execution of trigger.
N!dh!
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Hi All,
I am working on a GPS project, The GPS data is logged into oracle. The logger logs a huge amount of data.
I want to eleminate lot of data.
IF there are 2 consecutive rows with timestamp(11-NOV-08 08.52.36.000000000 AM) difference less than 30secs, i want to remove the 2nd row from getting displayed. This should work for the select so that the rows displayed by the select satement should not have 2 consecutive rows with time difference less than 30 secs.
If you have any sample queries on doing this, please post it. I will be a great help for me.
Thank you.
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You can test the condition for example with NOT EXISTS condition. Something like:
SELECT ...
FROM YourTableName alias1
WHERE NOT EXISTS (SELECT 1
FROM YourTableName alias2
WHERE alias2.DateTimeColumn > alias1.DateTimeColumn
AND alias2.DateTimeColumn <= alias1.DateTimeColumn
+ (1 / 24 / 60 / 3))
...
When adding to datetime, 1 means 1 day, so it's divided to get 20 seconds
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i'm using vb.net 2008 with msaccess 2003 database.i'm writing an windows application for calculating the employees attendance details like Number
of days worked, No of days Absent.I've a column named "Status" in access table.
query="SELECT Employee_ID, Employee_Name, count (*) as [Total Days] From EmpTable Where (Employee_Name='" & ComboBox1.Text & "' and
Attendance_Date between #" & Me.DateTimePicker1.Value.Date & "# and #" & Me.DateTimePicker2.Value.Date & "#) group by Employee_ID,
Employee_Name"
this query me ...Total Days (total working days including absent & present days of employee) as shown in the picture (Total Days column).I also wanted to show a new column which gives No of Days Present...so my query should look like this....
select count(*) as [Days Present] from EmpTable Where (Employee_Name='" & ComboBox1.Text & "' and
Attendance_Date between #" & Me.DateTimePicker1.Value.Date & "# and #" & Me.DateTimePicker2.Value.Date & "# and status='P')
i'm adding status column condition in where clause..."P" stands for present...as stored in status column of access database.
my requirement is to show the result using both the above mentioned queries...i mean how to combine these two queries into a single query which gives the output as i mentioned.
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Not sure if Access accepts this, but have a try:
SELECT Employee_ID,
Employee_Name,
count (*) as [Total Days],
(SELECT COUNT(*)
FROM EmpTable e2
WHERE e2.Employee_Name = e1.Employee_Name
AND Attendance_Date BETWEEN ? AND ?
AND e2.Status = 'P')
From EmpTable e1
Where Employee_Name = ?
and Attendance_Date between ? and ?
group by Employee_ID,
Employee_Name
Note, literals are replaced by parameters (read Colin's post).
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Hi Mika Wendelius,
Thanks a lot for your help.Query executes Perfectly with the desired results.
sorry for late reply...
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You're welcome
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Hi all,
I have created windows application in c#, it is Sample.exe,
If this exe is already running, andmeanwhile if double click and initiate one more instance of Sample.exe it should point to already running Sample.exe.
Concept is simple if my windows media player is running say a movie file is being run.
and if I launch media player from shortcut it will still show the already running one instead of opening the separate media player.
Is it possible to do so for my application, how can I apply same logic to my Sample.exe
Thanks,
ashok
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I don't see the connection with databases? You should be asking this in the C# forum.
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