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like this, in a loop, n is from 1 to 1000
<br />
UPDATE t1 set a=calc_heavily where id=n<br />
UPDATE t1 set b=a where id=n<br />
The problem is that, the second UPDATE fails sometimes. Is there a sync problem? How make it successful everytime.
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When you say it fails, do you get any error messages?
Have you tried transactions?
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How about:
<br />
UPDATE t1 set a=calc_heavily, b=a <br />
where id=n<br />
Regards
Guy
You always pass failure on the way to success.
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Hi all,
I'm currently doing a contract and supplier system, using VB.net and MSSQL.
I have this table (Contract) containing the following fields:
Contract_ID INT NOT NULL,<br />
Vendor_ID INT NOT NULL,<br />
ContractDate datetime,<br />
DateStart datetime,<br />
DateDue datetime,<br />
PRIMARY KEY(Contract_ID),<br />
FOREIGN KEY (Vendor_ID) REFERENCES Vendor(Vendor_ID)
1) I am going to do something like select contracts up for renewal in X months, eg in 3 months. (the syntax is one thing i'm not sure)
2) But the datetime format for both VB.net and MSSQL are different as shown below. (the format differs would matter too much? cos in the end, we are still proceeding with sql datetime format code.)
http://i5.tinypic.com/7xaeo95.jpg
http://i4.tinypic.com/739s66g.jpg
3) Do I put the codes in vb form or in vb's stored procedures?
I think it is something like this: http://www.outlookcode.com/d/code/remindbday.htm
But I have no idea how to start.
I hope the info I gave are not too vague. Any help is appreciated. Thanks.
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you can do it in Stored Procedure, use the convert function, then where clause to serve the purpose. something like
set @Date = CAST(DATEPART(YEAR, @Date) as varchar) + '-' + CAST(DATEPART(MONTH, @Date) as varchar)+ '-' + CAST(DATEPART(DAY, @Date) as varchar) + ' 00:00:00'
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Hi,
thanks for the reply. Regarding stored procedure, what would I need to do to show the contracts up for renewal?
But if you don't mind can you explain what the code does? What would be the @Date ?? Why is it plus-ing? Sorry, I quite a beginner for database.
telly
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@Date is your parameter @DateStart, convert the Dateformat, so that you can strip it out and select which ever datepart you want, like year, month, days. the concatination separates the date part, to be able to easily select
like select contractID from XXX
where @DateStart between 01-10-2007 to 03-12-2007
hope you get this time..
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hi...
plz somone help me write these queries..
i want to search the data's from employee select the employee name,designation_name
where
1)employee code that i can pass or else designation name i can pass
2)only one i can pass from theses 2
3)the employee can contain null value for desination name
4)constraint is :employee.designation_id=desig.designation_id
plz somone help me out to solve this pblm
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What part of your code are you specifically having difficulties with? At the moment, it sounds like you want someone to do your work for you.
You haven't stated what database you are you using. However if it is SQL Server, I suggest you do some research on writing stored procedures to encapsulate the logic for your search.
Paul Marfleet
"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush
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For SQL-Server:
select employee.name, designation.name
from employee
left outer join designation
on designation.designation_id = employee.designation_id
where employee.code = IsNull(@EmployeeCode, employee.code)
and IsNull(designation.name, '') = IsNull(@DesignationName, designation.name)
order by employee.name The outer join links the two tables together - even if there is no designation.
The IsNull bit allows you to optionally pass in a NULL or a proper value for the employee code and the designation.
Hope that helps.
Andy
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I have these (amongst others) tables in my database:
Tasks and Successors
Tasks hold details about task, and Successors has two taskIDs as forgien keys (jointly primary key) to hold data on the relationship between task.
Ie Task A has Tasks B and C as successors.
Task Table has three records for the task. The Successor table has TaskA/B and TaskA/C primary key feilds.
I'm using this on a C# Clone of MS Project. So I'm reading this data in and converting them into classes, in a tree structure so each Task Object has a List<task> of successors.
I can read this data in fine by just parsing the data in the tables. The problem comes when I want to put newly created data into the database, which is stored in this tree of instances of Task.
[b]If I put add a Task record into the database, how do I get the primary key of the one I've just put in so that I can create the records in the successor table to link them?[/b]
In my example I will probably have to added the tasks 1st so that when I add the successor records, the tasks actually exists. The algorithim for this will be quite simple if I was able to get the primary keys when I adding the tasks.
Anyone have any idea on how to do this?
Thanks for any help,
Ian.
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If you are using SQL Server, use SELECT ... = SCOPE_IDENTITY() after your insert statement.
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Here is the table
Project col1 col2 col3 col4
A 151,46 80 0,29 2
A 529,14 83 0,29 1
B 3391,3 80 0 2
B 3706,2 75 0,06 1
C 8685,3 78 2,41 1
C 9005,2 71 0 2
How do I get the max value for col1 for each project and its other values?
ie. project a's max value is 529,14. its others value is 80, 0.29 and 2
Project col1 col2 col3 col4
A 529,14 83 0,29 1
B 3706,2 75 0,06 1
C 9005,2 71 0 2
I have this query, but it results everything, not only the max value for each project
select project, max(col1), col2, col3, col4 from out_pumptable group by project, col2, col3, col4
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Try
SELECT g.Maximum, * from Projects, (SELECT MAX(col1) as Maximum FROM projects GROUP BY project)g WHERE MAX(col1) = g.Maximum
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it looks good, but the column project you have after group by isnt used anywhere. is it something missing before group by?
never mind about that.
I have tried the query and it results a little too much. it seems it loops for each max value and result for all row
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You're right - it has to be like that:
SELECT g.Maximum, * from Projects, (SELECT MAX(col1) as Maximum, project FROM projects GROUP BY project)g WHERE MAX(col1) = g.Maximum
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It still doesnt work.
It says an aggregate cant be in WHERE clause
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.
Tried with Having and it gives a lot other errors
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Sorry my fault, i copied the wrong string:
This should be the right thing:
SELECT g.Maximum, * from Projects, (SELECT MAX(col1) as Maximum, project FROM projects GROUP BY project)g WHERE col1 = g.Maximum <br />
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its working  , just one more thing >.<<br mode="hold" />
some rows in col1 has same value, is it possible to just have one of the values, just take from one row?
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Add a top 1 for example to the first select-statement.
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top 1 seems not be working good for this
I get this result, (partially), from the query you gave me
3320,9 P110101
3320,9 P110101
3220 P110102
3220 P110102
529,14 P110301
3706,2 P111501
P110102 got two rows, how do i get one of it only?
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Add a Group by-statement to the very end of the whole query.
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it feels like im getting annoying now
group by statement might work if i have an aggregate statement somewhere, now there isnt i cant do the group by
i am trying distinct now, but i get incorrect syntax
SELECT g.Maximum, distinct posnumber from out_pumptable, (SELECT MAX(flow_lpm) as Maximum, posnumber FROM out_pumptable GROUP BY posnumber)g WHERE flow_lpm = g.Maximum
this is actual code, posnumber is project
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This works for me:
SELECT g.Maximum, out_pumptable.posnumber from out_pumptable, (SELECT MAX(flow_lpm) as Maximum, posnumber FROM out_pumptable GROUP BY posnumber)g WHERE flow_lpm = g.Maximum group by g.Maximum, out_pumptable.posnumber
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