Computed Columns Asynchronously Updating?
Mar 19, 2008
I have a checksum calculation as a persisted, indexed computed column on a temporary table that I used to compare against original records to detect changes.
It seems that the update/ insert statements in my procs get out of sync on larger tables (500,000 rows +) with the checksum calculations. The only thing I can think of is that the column calculations are performed asynchronously in relation to the updates/ inserts. This is a problem for me.
Is my assumption correct? If it is, how can I adjust for this, i.e., force the computations to be performed synchronously or wait for the computations to complete before running comparisons?
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Mar 19, 2008
I have a checksum calculation as a persisted, indexed computed column on a temporary table that I used to compare against original records to detect changes.
It seems that the update/ insert statements in my procs get out of sync on larger tables (500,000 rows +) with the checksum calculations. The only thing I can think of is that the column calculations are performed asynchronously in relation to the updates/ inserts. This is a problem for me.
Is my assumption correct? If it is, how can I adjust for this, i.e., force the computations to be performed synchronously or wait for the computations to complete before running comparisons?
-Jeremy
___________________________
Geek At Large
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Jul 4, 2007
Is it possible to get a Computed column in one table to carry out a SELECT & SUM from a column in another table? I have tried a SELECT / FROM / WHERE construct but SQL complains about that.
Regards
Clive
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May 20, 2008
I am working with data that has a lot of records that get updated and inserted frequently, and to avoid having to create formulas through code all over the place, I am experimenting with computed column formulas. I have a question though.. It works well for any addition or subtraction (columnA+columnB), however, when I try to use division (columnA/columnB), it only returns integers, no decimals. I would like to have decimals, particularly with a specific scale and precision and I would really like to attempt this without any coding. Any suggestions?
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Oct 31, 2003
I have a table with fields called fname (First Name) and lname (Last Name). I need the userīs email thai is compose from lname and fname:
LOWER(LEFT (fname,1) + lname)
Is there any difference between creatig this computed column ia a table or in a view in SQL Server 2000?
I can do:
1. CREATE TABLE Users(
fname varchar(20),
lname varchar(20),
email as LOWER(LEFT (fname,1) + lname) )
Or
2. CREATE TABLE Users (
fname varchar(20),
lname varchar(20))
CREATE VIEW Vw_users (fname, Lname ,
email)
AS
SELECT fname, Lname ,
LOWER(LEFT (fname,1) + lname) )
Is one of them is better?
Paulo
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Nov 6, 2006
Dear all,
Pls help me with this
I have 2 tables
Trip (TripID, Duration)
Reserve(ReserveID, TripID, StartDay, EndDate)
in which EndDate = StartDay + Trip.Duration
How can I do this?
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Jul 20, 2005
I have a table with fields called fname (First Name) and lname (LastName). I need the userīs email thai is compose from lname and fname:LOWER(LEFT (fname,1) + lname)Is there any difference between creatig this computed column ia a tableor in a view in SQL Server 2000?I can do:1. CREATE TABLE Users(fname varchar(20),lname varchar(20),email as LOWER(LEFT (fname,1) + lname) )Or2. CREATE TABLE Users (fname varchar(20),lname varchar(20))CREATE VIEW Vw_users (fname, Lname ,email)ASSELECT fname, Lname ,LOWER(LEFT (fname,1) + lname) )Is one of them is better?Paulo*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Sep 25, 2006
Hi,
Consider the following example
create table sample
(col1 int,
col2 int ,
col3 AS col1 + col2) PERSISTED NOT NULL)
basically col3 is a computed column. Now when ever a row in col1 or col2 is updated the computed column will reflect the new value. how does this happen in the background. does this use row level triggers or what other mechanism is used to maintain col3 - computed column
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Jul 8, 2004
Hi,
What is the difference between a computed column and a UDF?
Is a computed column the same as the "Formula" field under Design Table in Enterprise Manager?
Also, what is the proper syntax for the Formula field? Can I use regular SQL on it or is there more to it?
thanks,
Frank
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Aug 22, 2006
Hi, I have a small problem with my database. I've got following situation: I have a computed column, which value is base on currency rate: rent * rate. Users have to have possibility to change currency rate easily (maybe another table or constant). Is there any way to create formula, which would compute value properly, via constant or something like this? Or the easiest workaround would be load data into dataset (I'm building asp.net application - database will be very small - couple of hundreds of records) and make calculations programmatically?
Przemek
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Oct 8, 2007
Hi,
I have a table with 4 columns let us say A,B,C,D.
column D is computed column with formula A + '-' + B
Now, i want to add one more condition to the formula which looks like "A + '-' + B + '-' + C".
Please let me know how to do this using T-SQL as i cannot open the table in design mode in production server.
Thanks in Advance!!
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Nov 13, 2001
i have a table containing the column "current month" and "current day" as smallint which contains the number of months since 1900-01-01 and the day of this month. now i want to trnslate this column in a smalldatetime ( not datetime !) value using a computed column and then create an index on that column.
the formula should be:
dateadd(d,[current day]-1,
dateadd(m,[current month],convert(smalldatetime,'1900-01-01'))
)
trying to create an index on this column results in an error message saying
that the formula is nondeterministic or imprecise
removing the convert statement leaving only the date results in a column of type datetime and creating the index works fine
replacing convert(smalldatetime,'1900-01-01') with a column name which has the type smalldatetime also allows to create an index but thats not what i want to do.
it seems that sql2000 thinks a convert from a string to a date is nondeterministic. Is there any possibility to create a const of type smalldatetime without using convert?
Any idea?
(besides this, datediff(d,'yyyy-mm-dd',anydate) is nondeterministic but datediff(d,dateadd(d,0,'yyyy-mm-dd'),anydate) is deterministic. strange...)
and
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Jun 25, 2004
I am having a problem with using UDF as part of a temp table computed column. Here's the sample code:
IF EXISTS( SELECT 1 FROM information_schema.routines WHERE routine_name = 'fn_test')
DROP FUNCTION dbo.fn_testGO
CREATE FUNCTION dbo.fn_test( @x int, @y int)
RETURNS INT AS
BEGIN
DECLARE @z INT
SET @z = @x + @y
RETURN @z
END
GO
CREATE TABLE #X
(
x INT,
y INT,
z AS (dbo.fn_test(x,y))
)
I receive the following error:
Server: Msg 208, Level 16, State 1, Line 2
Invalid object name 'dbo.fn_test'.
I do not get this error if I use a regular table.
HELP!
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Jul 25, 2012
Suppose a table being
Create table myTable (ID int, col1 int, col2 int)
I know how to make a computed column being the sum of other column for the same ID e.g. "computed_column = col1 + col2".
Getting the average would be "computed_column = (col1 + col2)/2" But how to get the Max, Min?
Even "Sum(col1,col2)" or AVG(col1, col2) does not work as the formula for a computed column...
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Apr 1, 2015
I have a table that I cannot allow a computed field to exist on (due to a 3rd party software), so I am thinking I could create a view with a computed field that is persistent, is that possible?
the syntax below will not work, I am not even sure if this is possible, but if it can work, that would be great.
I am wanting to get the sum of jetfoot1, 2 & 3 and have the total added up as "total"
create view ViewSumReport as
select JETFOOT1,JETFOOT2,JETFOOT3,(JETFOOT1+JETFOOT2+JETFOOT3)as [total] persisted
from dbo.fielddata
GO
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Jul 23, 2005
In SQL Sever, do the size of computed columns gets added to the totalsize of the tables? Does SQL server stores the actual values incomputed columns?Thanks_GJK
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May 26, 2006
I need to create an function similar to the "MATCH" function in Excelthat evaluates a number within a set of numbers and returns whetherthere is a match. I have put the example of what I see in excel in thecheck column. The "0" answer in the result column is in the fourthaccount in the list. Somehow I need to loop through the accountscomparing the result to the total and indicate a match in the checkcolumn. It wouldn't even need to tell me the row number; it could be a0 or 1.account total result check123770266.84124.2112377026131.050 412377026164.38-33.33123770260131.051237702678.7152.3412377167-31.34221.891237716731.34159.211237716738.55152 51237716731.34159.211237716715238.5512377167490.91-300.36123771670190.55123771670190.5512377167-31.3443.341237716731.34-19.341237716738.55-26.551237716731.34-19.3412377167152-14012377167490.91-478.9112377167012123771670121237736347.058412377363131.05012377363-45.38176.4312377363-47.05178.11237736347.0484.0112377363-47.04178.091237736347.058412377363541.11-410.06123773630131.0512377363672.15-541.11237750737.64152.91
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Nov 12, 2007
Does tsql allow sth like
Select col1*col2 as ComputedColumn, ComputedColumn + 2 as NewColumn
From T_Table
THis is possible in Access.
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Aug 30, 2007
Hello,
does anyone know a website, where I can read something about the syntax of Computed Columns?
I don't know how to enter the following expression in the computed columns field of MS SQL Server:
When x-y < 0 Then 0 else x-y
Thank you
M-l-G
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Oct 31, 2002
Instead of using Full-Text indices, which I don't like to manage, we've tried to use seperate tables that contain recordID, the word, a count of the word in the parent field and computed column which is the CHECKSUM() of the word column. I indexed the checksum column with a clustered index.
Works great in Query Analyser. But when the ASP page calls it, I get this message:
Microsoft OLE DB Provider for SQL Server (0x80040E14)
INSERT failed because the following SET options have incorrect settings: 'ARITHABORT'.
Same for updates and deletes. The question is how should these SET settings be done? Any ideas would be greatly welcomed.
Thanks
Jason
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Jul 20, 2005
Using SS2K, I'm getting the following error while bulk inserting:Column 'warranty_expiration_date' cannot be modified because it is acomputed column.Here is my bulk insert statement:BULK INSERT dbo.TestDataFROM 'TestData.dat'WITH (CHECK_CONSTRAINTS,FIELDTERMINATOR='|',MAXERRORS = 1,FORMATFILE='TestData.fmt')The computed column is not referenced in the format file and the data filedoes not contain the computed data.Thanks
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Sep 21, 2007
Hi All,
I am facing a problem to update the columns.
The issue is ..I am having 340 tables in SQL database with a total of 8500 columns.
The descriptions for all the columns in an excel sheet.
Is there any means by which we can run a query that which loads the descriptions to all the columns instead of doing that manually?
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Jun 18, 2002
Good morning,
I want to update two columns in the same time by making a select from another table. Some think like the following;
Update TBL1 o set (o.COL1,o.COL2) =
(select f.COL1,f.COL2 from TBL2 f where f.PKY = o.PKY)
where o.COL3 = 100;
Thinks to helping me .
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Apr 25, 2014
I have a large table with many columns that have rows with N/A or null values, which are gotten from a bulk insert.
In order to format the data properly, we need to convert the data from N/A or null to 0, as the original values come from the supplier.
In my code the best way to achieve this is running multiple queries as
update csv_testing set testing5 = 0 where testing5 like'%N/A%'
update csv_testing set testing6 = 0 where testing6 like'%N/A%'
update csv_testing set testing7 = 0 where testing7 like'%N/A%'
update csv_testing set testing9 = 0 where testing9 like'%N/A%'
etc for about 12 columns
is there a better way of doing this ?
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Apr 2, 2007
Hi guys.........i'm tryign to update 2 tables in one stored procedure. However i'm getting errors. heres the code i have:
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[snow_ors_additionalInfoUpdate]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[snow_ors_additionalInfoUpdate]
GO
CREATE PROCEDURE dbo.snow_ors_additionalInfoUpdate
@Reference int,
@CanTravel int,
@SEEmployee varchar(100),
@SE_EMPLOYEE_FROM datetime,
@SE_EMPLOYEE_TO datetime,
@WorkHours Varchar(100),
@DrivingLicence varchar(100),
@CriminalConvictions bit,
@CriminalConvictionsDetails1 text,
@CriminalConvictionsDate1 datetime,
@CriminalConvictionsDetails2 text,
@CriminalConvictionsDate2 datetime,
@CriminalConvictionsDetails3 text,
@CriminalConvictionsDate3 datetime,
@VacancyMonitoring Varchar(100),
@VacancyMonitoringDetails Varchar(50),
AS
UPDATE Account
SET CanTravel= @CanTravel,
SEEmployee = @SEEmployee,
WorkHours= @WorkHours,
DrivingLicence = @DrivingLicence,
CriminalConvictions = @CriminalConvictions,
CriminalConvictionsDetails1 = @CriminalConvictionsDetails1,
CriminalConvictionsDate1 = @CriminalConvictionsDate1,
CriminalConvictionsDetails2 = @CriminalConvictionsDetails2,
CriminalConvictionsDate2 = @CriminalConvictionsDate2,
CriminalConvictionsDetails3 = @CriminalConvictionsDetails3,
CriminalConvictionsDate3 = @CriminalConvictionsDate3
WHERE Account.Reference = @Reference
UPDATE Application
SETVacancyMonitoring = @VacancyMonitoring,
VacancyMonitoringDetails = @VacancyMonitoringDetails,
WHERE Application.Reference = @Reference
GO
and here are the errors i'm getting:
Server: Msg 156, Level 15, State 1, Procedure snow_ors_additionalInfoUpdate, Line 19
Incorrect syntax near the keyword 'AS'.
Server: Msg 156, Level 15, State 1, Procedure snow_ors_additionalInfoUpdate, Line 37
Incorrect syntax near the keyword 'WHERE'.
thanks again guys!
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Jan 24, 2008
I have a table in the one of our dbs that gets updated through out the day. I believe there are quite a bit of columns that can be moved into a separate table to help with some db contention. Is there some way to audit or view which columns are getting updated on a daily basis?
thanks
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May 3, 2007
I am attempting to write a conversion of our product for Compact Edition; we already provide it based on SQL Server. The database interface uses ADO through a Python-win32com adaptor, and has worked fine so far. (Note: *not* ADO.net, just plain old COM)
Now, a curious thing happens. When inserting new data through a Recordset, everything works fine - except for columns defined as bigint. There are no exceptions thrown, but when you read the columns back they contain nothing but zeroes. Do the same to any other column type - I've tried integer, numeric, float, nvarchar and ntext so far, and they all seem to work just fine. It does not seem to be conversion-related either, since I've tested the exact same data to various column types. And using bigint on regular SQL Server works just fine.
The code involved is quite unspectacular, and simply switching the column types to integer would solve the immediate problem, but causes potential future issues since we normally store internal IDs in bigint columns, and the values may grow quite large.
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Oct 1, 2007
I have a web interface where i have listing of several data and check box for inserting data into SQL server 2005 database table,
so I am able to inset data to sql tables using stored procedure. Now the question is i want to update these inserted records(agency approval column inserted as 1) in same table and assign value 1 fot the checked data to column finace approval as 1.
Here is how ia have webclas library where i script for getting the insert parameterspublic void Process_Payment(ref DataTable TableWithPayments, string Payment)
{SqlCommand InsertCommand = new SqlCommand();
SqlConnection AccessDatabase = new SqlConnection(FinanceSourceWrite.ConnectionString);int PaymentID = 0;
AccessDatabase.Open();
InsertCommand.Connection = AccessDatabase;
//DataTable TemporaryTable = new DataTable();
//TemporaryTable = TableWithPayments;SqlTransaction TransactionProcess = null;
SqlParameter InsertParameters;foreach (DataRow DataCommentInfo in TableWithPayments.Rows)
{InsertCommand.CommandText = "InsertPaymentList"; //THIS IS my stored procedureInsertCommand.CommandType = CommandType.StoredProcedure;
TransactionProcess = AccessDatabase.BeginTransaction();
// SET ALL THE VALUES FOR THE PARAMETERSInsertParameters = InsertCommand.Parameters.Add("@JC_ID", SqlDbType.Int);
InsertParameters.Direction = ParameterDirection.Input;InsertParameters.Value = DataCommentInfo["JC_ID"];
InsertParameters = InsertCommand.Parameters.Add("@Payment_Type", SqlDbType.Int);
InsertParameters.Direction = ParameterDirection.Input;InsertParameters.Value = DataCommentInfo["Payment_Type_ID"];
InsertParameters = InsertCommand.Parameters.Add("@Agency_approval", SqlDbType.Int);InsertParameters.Direction = ParameterDirection.Input;
InsertParameters.Value = DataCommentInfo["Agency_approval"];
Now my stored procedure
ALTER PROCEDURE [dbo].[InsertPaymentList](
@JC_ID int ,
@Payment_Type int,
@Payment_Group int,
@AGENCY_ID int,
@Agency_approval int,
@Agency_approval_date datetime,
@Program_ID nvarchar(50),
@Status bit,
@Jobsite_code_ID int,
@Date_Stamp datetime,
@Provider nvarchar(50),
@UserName nvarchar(256),
@Activity_ID int,
@Subproject_ID int,
@Payment_Support_Retention_List_ID int,
@WPR_ID int,
@Placement_ID int,
@Enrollment_ID int,
@Satisfaction_ID int,
@Enrollment_Bonus_ID int,
@Re_Placement_Bonus_ID int
)AS
INSERT INTO Payment_LIST_AIMS
(JC_ID, Payment_Type, Payment_Group, AGENCY_ID, Agency_approval,
Agency_approval_date, Program_ID, status,
Jobsite_code_ID, Provider, UserName, Placement_ACTV_ID, Placement_Sub_ID, Support_Retention_ID, WPR_ID, Placement_ID,Enrollment_ID,Satisfaction_ID,Enrollment_Bonus_ID,Re_Placement_Bonus_ID)
VALUES @JC_ID, @Payment_Type, @Payment_Group, @AGENCY_ID, @Agency_approval,@Agency_approval_date, @Program_ID, @Status,
@Jobsite_code_ID, @Provider, @UserName, @Activity_ID,
@Subproject_ID, @Payment_Support_Retention_List_ID, @WPR_ID, @Placement_ID,@Enrollment_ID,@Satisfaction_ID,@Enrollment_Bonus_ID,@Re_Placement_Bonus_ID)
SELECT CAST(scope_identity() as int)
Here like you see agency approval column in SQL server table gets value assigned as 1 when Agency user clicks the confirm payment button and so all the values as above....
Now another user Finance user process the same records from the web UI and clicks the process payment button at this stage ..i need to update Finance approval column as 1 agains that particular record existing th the SQL table, there are two three coulmc to be updated , Finance approval(this is where i need help) , Finance approval date , and user
Being a newbie please help me whith how i can fix this
Thanks
Santosh
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Dec 6, 2012
I am trying to update a SQL table using an excel file which has 2 columns FMStyle and FMHSNum.
FMStyle is my link to the SQL table.
Here is what I have for code....
--------------------------------------------------
Update DataTEST.dbo.zzxstylr
SET hs_num = (select FMHSNum FROM OPENROWSET('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0;Database=c: empStyleHSCodesLoad.xls;HDR=YES ', [Sheet1$]))
Where FMStyle = zzxstylr.style
--------------------------------------------------
Everything seems to be ok except for the "Where FMStyle" is giving me a message Invalid Column name on FMStyle. Do I need to qualify FMStyle and if so how.
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Jun 29, 2015
I have a table which has two column like following table and I don't know how can I update theses two column with identity numbers but just the fields which are equal 111.
my example table:
numez numhx
111 111
111 111
0 111
111 0
111 0
and my results should be:
numez numhx
1 2
3 4
0 5
6 0
7 0
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Dec 8, 2006
I want to set a column to 0 if it is set to a certain number. There are several columns to check though, so I am wondering if I can do it all in one query, or if I have to do it in single queries?
here is an example:
account | contact_id_1 | contact_id_2 | contact_id_3
433 | 67 | 23 | 67
so I want to set any contact_id_N = 0 where contact_id_N is = 67
so in the end, the table will look like this:
account | contact_id_1 | contact_id_2 | contact_id_3
433 | 0 | 23 | 0
is there a way to do it in one statement?
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Mar 18, 2008
Hi Gnite everyone, i once again need help with a T-SQL syntax for Auto Correction for insert and update when client enters the wrong format, i;e, creating a SSN Data type and a User Defined Procedure that auto corrects input format i;e,
user inserts into table authors of the pubs DB 525-477845 column au_id that executes auto correction so user doesn't have to put in dashes for SSN format. Please help me with this syntax .
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Feb 25, 2008
I have a question. I know its possible to create a dynamic query and do an exec @dynamicquery. Question: Is there a simpler way to update specific columns in a table at run time without doing if else for each column to determine which is null and which has a value because i'm running into a design dilemna on how to go about it.
FYI: All columns in the table design are set to null by default.
Thanks in advance,
Dimeji
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