.NET Framework :: CLR Table Function With Null Values
Jun 23, 2015
I'm trying to do a Clr function wiht null values but I have an error. My Clr is like this:
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Collections;
using System.Text;
[code]...
A .NET Framework error occurred during execution of user-defined routine or aggregate "function":
System.InvalidCastException: La conversión especificada no es válida.
System.InvalidCastException:
  en Microsoft.SqlServer.Server.ValueUtilsSmi.GetSqlInt16(SmiEventSink_Default sink, ITypedGettersV3 getters, Int32 ordinal, SmiMetaData metaData)
  en UserDefinedFunctions.function()
View 5 Replies
ADVERTISEMENT
Jun 29, 2015
I have tables and a function as representated by the code below. The names  for objects here are just for representation and not the actual names of objects. Table RDTEST may have one or multiple values for RD for each PID. So the function GIVERD will return one or multiple values of RD for each value of PID passed to it.
When I run the following query, I get the required result except the rows for CID 500 for which PID is NULL in table T1. I want the rows for CID 500 as well with PID values as NULL.
SELECT Â A.CID,Â
A.ANI,
A.PID,
B.RD
FROM T1 AS A CROSS APPLY GIVERD(A.PID) B
CREATE TABLE [DBO].[RDTEST](
[PID] [INT] NULL,
[RD] [INT] NULL
)
[Code] ....
View 4 Replies
View Related
Oct 4, 2007
Hi,
I have a CLR function that throws an error if one of the parameters is NULL. Am I using the IsNullable tag correctly or am I supposed to do this another way? The function simply formats decimal values using .NET culture information and returns a string. Thanks very much for any help. -- Erik
[Microsoft.SqlServer.Server.SqlFunction(IsDeterministic=true, DataAccess=DataAccessKind.None)]
[return: SqlFacet(MaxSize = 30, IsNullable=true)]
public static string FormatGeneralDecimal([SqlFacet(Precision = 28, Scale = 8, IsNullable = true)] SqlDecimal sqlDc,
[SqlFacet(MaxSize = 10)] string cultureName)
{
string result = null;
if (!sqlDc.IsNull)
{
CultureInfo ci = CultureInfo.CreateSpecificCulture(cultureName);
result = sqlDc.Value.ToString("G", ci);
}
return result;
}
It works great unless I call it with a NULL value for sqlDc, in which case I get this:
select [dbo].[FormatGeneralDecimal](NULL, 'de-DE')
Msg 6522, Level 16, State 2, Line 1
A .NET Framework error occurred during execution of user-defined routine or aggregate "FormatGeneralDecimal":
System.Data.SqlTypes.SqlNullValueException: Data is Null. This method or property cannot be called on Null values.
System.Data.SqlTypes.SqlNullValueException:
at System.Data.SqlTypes.SqlDecimal.ToDecimal()
at System.Data.SqlTypes.SqlDecimal.get_Value()
at MyFunctions.FormatGeneralDecimal(SqlDecimal sqlDc, String cultureName)
View 1 Replies
View Related
Jun 15, 2015
I'm running the following test query on a single table:
SELECT sph.datestamp, sph.stocksymbol, sph.closing, DATENAME(dw, sph.datestamp),
CASE DATENAME(dw, sph.datestamp)Â Â Â
WHEN 'Monday' then 'Monday'Â Â
ELSE (SELECT CAST(sph2.datestamp AS nvarchar) FROM BI_Test.dbo.StockDB AS sph2 WHERE sph2.DateStamp = DATEADD(d, -1, sph.datestamp) AND sph2.StockSymbol = 'NYA')Â
END AS TestCase,
[Code] ....
And here's an example of the output I'm getting:
Why the exact same subquery in the THEN of the second CASE statement is returning NULL when the first one completes as expected?
View 7 Replies
View Related
Jan 25, 2008
I have a pivot transform that pivots a batch type. After the pivot, each batch type has its own row with null values for the other batch types that were pivoted. I want to group two fields and max() the remaining batch types so that the multiple rows are displayed on one row. I tried using the aggregate transform, but since the batch type field is a string, the max() function fails in the package. Is there another transform or can I use the aggragate transform another way so that the max() will work on a string?
-- Ryan
View 7 Replies
View Related
Sep 3, 2015
I am having a trouble when I try to retrieve a SQL parameter outside to .Net Clr
I did a clr example like this:
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Text;
using Microsoft.SqlServer.Server;
[Code] ...
I now my trouble and it is because the parameter @p_it is null when I try to sed it to pipe in SqlContex but really it is not null. When I test the clr with this code:
CREATE ASSEMBLY
[Test]
FROM
N'Z:SomeRouteTest.dll'
WITH PERMISSION_SET = SAFE
GO
CREATE PROCEDURE [dbo].[Test]
[Code] ....
I obtain the next error message:
"Mens 6522, Nivel 16, Estado 1, Procedimiento Test, LÃnea 14
A .NET Framework error occurred during execution of user-defined routine or aggregate "Test":
System.ArgumentNullException: El valor no puede ser nulo. -----> The value can not be null
Nombre del parámetro: message
System.ArgumentNullException:
  en Microsoft.SqlServer.Server.SqlPipe.Send(String message)
  en Test.StoredProcedures.Test(SqlString p_t)"
View 3 Replies
View Related
Jan 21, 2008
I'm using an ObjectDataSource in Visual Studio to retrieve records from a SQL Server 2005 database.
I have a very simple dilemma. In a table I have fields FirstName, Surname, Address1, Address2, Address3 etc. None of these are mandatory fields.
It is quite common for the user not to enter data in Address2, Address3, so the values are <null> in the SQL table.
In Visual Studio 2005 I have an aspx form where users can pass search parameters to the ObjectDataSource and the results are returned according to the passed in parameters.
The WHERE clause in my Table Adapter is:WHERE (Address1 LIKE @Address1 + '%') AND (Address2 LIKE @Address2 + '%') AND (Address3 LIKE @Address3 + '%') AND (FirstName LIKE @FirstName + '%') AND (Surname LIKE @Surname + '%')
If, for example, I simply want to search WHERE FirstName LIKE ‘R’, this does not return any results if the value of Address3 is <null>
My query is this: Could someone please show me the best way in Visual Studio 2005 to return records even if one of the Address fields is <null>.
For reference, I have tried: Address3 LIKE @Address3 + '%' OR IS NULLThis does work, however itsimply returns every instance where Address3 is <null> (accounting for about 95% of the records in the database). Thanks in advance Simon
View 9 Replies
View Related
May 7, 2015
I am trying to change a column from a decimal(18,2) to a decimal(18,3). What is the SQL command to alter this table?
SQL Command:
alter table TableName
alter column ColumnName decimal(18,3) [null]
the above command is right ?
View 6 Replies
View Related
Jul 20, 2005
Question: Why would I not be able to import an Access 97 table inwhich some records have null values in fields that allow null values?Wouldn't the table's design be imported first, bringing the columns'"allow nulls" attribute with it?I'm dealing with both text and numeric columns. Not all columnscontaining nulls cause an error.Thanks,Bob C.
View 2 Replies
View Related
Sep 17, 2007
Dear Members,
I extracted data from a flat file using SSIS package and load them into destination table. One column contains no data. Data type of that column is varchar(9). I want to display "NULL" values in that column.
I used LOOK up transformation and used the following query.
SELECT PassThroughRouting =
CASE PassThroughRouting
WHEN 'NULL' THEN 'NULL'
END
FROM EPICWareTable
But it gives a error message.
Does any body can help me?
Thanks
View 9 Replies
View Related
Jan 29, 2008
Hi,
How do I filter out Null values in a matrix table
one off my columns is picking up the Null values and I would like to filter this out.
Is there a simple way of doing this as filtering it out at the Dataset level is not the ideal solution for me.
thanks
View 5 Replies
View Related
Feb 27, 2007
I have two tables 1) tblCustomer (ID, Name, City) 2) tblemp (ID, NAME, Dept.ID, tblcustomer.ID)
Both the tables have ID as PKA emp can be either assigned a) All customers b)single customer c) NO customer
Pls note:- there will never be 2 or 3 customer linked to emp (my actuall requirement tables are different but to explain i am using the above tables)
I know how to assign single customer......but had problem how to link all customers and "no customer"
Please tell me if the following solution is right?1) I will manually insert a record in tblCustomer with id 0 as " all customers" and will not allow the user to delete it 2) store null in FK if it is "no customer"
Also please tell me is it ok to store one more value in tblCustomer as -1 and take it as "No customer"
I have a DDL in the Employee page which should be displaying the names of allthe customers with 2 extra values "ALL CUSTOMERS" and "SELECT" Select is the default value in DDL which says "NO CUSTOMER" selected yet
Thank youSara
View 10 Replies
View Related
Mar 21, 2014
I have a table with data in two columns, item and system. I am trying to accomplish is we want to compare if an item exists in 1, 2 or all systems. If it exists, show item under that system's column, and display NULL in the other columns.
I have aSQL Fiddle that will allow you to visualize the schema.
The closest I've come to solving this is a SQL pivot, however, this is dependent on me knowing the name of the items, which I won't in a real life scenario.
select [system 1], [system 2], [system 3]
from
(
SELECT distinct system, item FROM test
where item = 'item 1'
) x
pivot
(
max(item)
[Code]...
View 2 Replies
View Related
Jul 20, 2005
HiI need some help on achieving the following:I wrote a querie which collects Data out of three Tables, the Resultlooks like this:SET NOCOUNT ONDECLARE @ROWINTDECLARE @CURPTNO CURSORSET @CURPTNO = CURSORFORSELECT * FROM TEMPOPEN @CURPTNOFETCH NEXT FROM @CURPTNOINTO @ROWWHILE (@@FETCH_STATUS = 0)BEGINSELECT ONE.CYNO, ONE.ROLE, ONE.ROL_BEZ, ONE.PTNO, ONE.NOCY, TWO.TEXTAS NOCY_TEXTFROM(SELECT CY.CYNO,RE.CYNO AS RECYNO, RTRIM(RE.ROLE) AS ROLE, RTRIM(V_ROLE.TEXT) ASROL_BEZ,RE.PTNO AS PTNO, RTRIM(RE.NAME) AS SACHBEARBEITER, RE.NOCYFROM CYRIGHT OUTER JOINRE ON RE.CYNO = CY.CYNOINNER JOINV_ROLE ON RE.ROLE = V_ROLE.CODEWHERE (RE.PTNO IN(SELECT PT.PTNOFROM PTWHERE PT.PTNO IN(@ROW)AND V_ROLE.LANGUAGE = PT.CLANG))) AS ONELEFT JOIN(SELECT V_NOCY.CODE, V_NOCY.TEXTFROM V_NOCYINNER JOINPT ON PT.CLANG = V_NOCY.LANGUAGEAND PT.PTNO IN (SELECT PT.PTNOFROM PTWHERE PT.PTNO IN(@ROW))) AS TWOON ONE.NOCY = TWO.CODEFETCH NEXT FROM @CURPTNOINTO @ROWENDCLOSE @CURPTNODEALLOCATE @CURPTNOThe Result looks like this:RS1:6313,1300,Architekt,99737505,NULL,NULL2392762,100,Bauherr,99737505,NULL,NULLRS2:2693265,100,Bauherr,99756900,NULL,NULLNULL,1,Planer,99756900,2,Bauherr macht Pläne selberRS3:2691919,100,Bauherr,99755058,NULL,NULL2691962,6000,Kontakt,99755058,NULL,NULLMy Problem is, that I need to have all the Resultsets in one Table atthe end.So my further undertaking was to create a Temp Table with theexpectation to receive all the resultsets in one Step.The TSQL for this looks like that:SET NOCOUNT ONCREATE TABLE #CYRE_TEMP(CYNOINT NULL,ROLEINT NULL,ROL_BEZVARCHAR (60) NULL,PTNOINT NULL ,NOCYINT NULL,TEXTVARCHAR (60) NULL)GODECLARE @CYNOINT,@ROLEINT,@ROL_BEZVARCHAR (60),@PTNOINT,@NOCYINT,@TEXTVARCHAR (60),@ROWINT,@CURPTNOCURSORSET @CURPTNO = CURSOR FORSELECT PTNO FROM TEMPOPEN @CURPTNOFETCH NEXT FROM @CURPTNOINTO @ROWWHILE (@@FETCH_STATUS = 0)BEGININSERT INTO #CYRE_TEMP (CYNO, ROLE, ROL_BEZ, PTNO, NOCY, TEXT)VALUES(@CYNO,@ROLE ,@ROL_BEZ ,@PTNO ,@NOCY ,@TEXT)SELECT @CYNO = ONE.CYNO,@ROLE = ONE.ROLE,@ROL_BEZ = ONE.ROL_BEZ,@PTNO = ONE.PTNO,@NOCY = ONE.NOCY,@TEXT = TWO.TEXTFROM(SELECT CY.CYNO, RTRIM(RE.ROLE) AS ROLE, RTRIM(V_ROLE.TEXT) ASROL_BEZ,RE.PTNO AS PTNO, RTRIM(RE.NAME) AS SACHBEARBEITER, RE.NOCYFROM CYRIGHT OUTER JOINRE ON RE.CYNO = CY.CYNOINNER JOINV_ROLE ON RE.ROLE = V_ROLE.CODEWHERE (RE.PTNO IN(SELECT PT.PTNOFROM PTWHERE PT.PTNO =@ROWAND V_ROLE.LANGUAGE = PT.CLANG))) AS ONELEFT JOIN(SELECT V_NOCY.CODE, V_NOCY.TEXTFROM V_NOCYINNER JOINPT ON PT.CLANG = V_NOCY.LANGUAGEAND PT.PTNO IN (SELECT PT.PTNOFROM PTWHERE PT.PTNO =@ROW)) AS TWOON ONE.NOCY = TWO.CODEFETCH NEXT FROM @CURPTNOINTO @ROWENDCLOSE @CURPTNODEALLOCATE @CURPTNOSELECT * FROM #CYRE_TEMPDROP TABLE #CYRE_TEMPGOAnd the Output looks like this now:Q1:NULL,NULL,NULL,NULL,NULL,NULL2392762,100,Bauherr,99737505,NULL,NULLNULL,1,Planer,99756900,2,Bauherr macht Pläne selberCan someone help me getting all the 6 Rows into one Table as Output?I appreciate any available Help on this..Ssscha
View 1 Replies
View Related
Jun 12, 2007
What would be an equivalent expression for ISNULL(datafield, 0) for a table/matrix cell? I am using iif( Len().. to find out if there is something in the cell, and displaying zero in the cell if the length of cell item is 0, however am wondering if there is any better/elegant way of doing that?
View 3 Replies
View Related
Apr 10, 2008
We are just upgrading a server from 2000 to 2005 and we are getting the message below when we execute a sql statement against a table with a date field with null values:
"Error converting data type DBTYPE_DBTIMESTAMP to datetime."
View 3 Replies
View Related
Jun 6, 2006
Hi,
I have a data transform from a flat-file to a SQL server database.
Some of the flat-file fields have NULL values. The SQL table I'm
importing into does not allow NULL values in any field, but each field
has a Default value specified.
I need to have it so that if a null value comes across in a field using
the data transform, it takes the table default on import. I could of
sworn I had this working a few days ago, but I get errors now that
state I'm violating table constraints. Has anyone done this before?
Thanks
Jeff
View 5 Replies
View Related
Nov 1, 2014
I have rather simple CLR function:
[SqlFunction(IsDeterministic = true, DataAccess = DataAccessKind.None)]
public static SqlString GetUserName()
{
return (SqlString)WindowsIdentity.GetCurrent().Name;
}
When I get result from .NET console app, I get correct answer "JungleSektor". However, when SQL Server executes this code, it gives me "NT ServiceMSSQL $ SQL2014". How to get correct result?
View 1 Replies
View Related
May 5, 2004
Hi,
We Have Been Trying To Convert Some Pf The Procs Into Functions Of Late,but There Is A Problem :-we Have Been Unable To Return More Than 1 Table Value From A Function.
Create Function F_clusters()
Returns @ki Table(names Nvarchar(200),total Int),
As
Begin
Insert @ki
Select Names,count(distinct Chremail) As From Customer
Where Chremail Is Not Null
Return
End
This Works Fine :-
And Gives The Reqd. Results.
But,
If I Am Using The Same Function To Return Two Tables Then It Doesn't Work,could You Pls Chk.
Create Function F_clusters()
Returns @ki Table(names Nvarchar(200),total Int),@k2 Table(names Nvarchar(200),total Int)
As
Begin
Declare @cnt Int
Set @cnt = 1
While @cnt <= 2
If @cnt =1
Begin
Insert @ki
Select Names,count(distinct Chremail) As From Customer
Where Chremail Is Not Null
Set @cnt = @cnt + 1
End
If @cnt =2
Begin
Insert @k2
Select @naamre,count(distinct(a.intcustomerid)) As Pura_ginti From Trcustomerpreference03july A Inner Join Cleancustomer B
On A.intcustomerid = B.intcustomerid
Where Chremail <> ' ' And Chremail Is Not Null
And Intpreferenceid In (6,7,2,3,12,10)
Set @cnt2 = @cnt2 + 1
End
End
Return
End
Can We Return Two Tables Or Is It Not Possible ?
Pls Chk Into This And Tell Me.
Thanks.
View 13 Replies
View Related
Oct 21, 2012
I have a stored procedure that is passed two values. Both are strings representations of GUID values, the first is a single value, the second is a comma delimited string of values.In the stored procedure I call a split function to separate the comma delimited values into a table and this is used in my WHERE clause to filter my select results.This is an example:
Code:
SELECT
item.uiGUID as ItemGUID,
stores.strStoreName as Store,
location.strLocationName as Location
FROM tblItems as item
INNER JOIN tblStoreLocations as location
ON item.uiLocationGUID = location.uiGUID
INNER JOIN tblStores as stores
ON location.uiStoreGUID = stores.uiGUID
WHERE CAST(item.uiGUID as varchar(36)) IN (SELECT Value FROM dbo.Split(',',@ItemGUIDList))
When I run this query in the management studio, passing a list of 5 values in the second parameter, my results include one item for each of the 5 values. However, when I pass the parameters from my ASP project, (I've verified the values I think are being passed are indeed being passed), I only get one item.I believe the error is in my split function. Both split functions return the same results in the SQL management studio, but only one returns the correct results in the the ASP project.
When I use this version of the function it returns the correct table values to the calling application, but it chokes when the item list does not have a trailing comma. I figure that to be a bug in the SQL function.
Code:
CREATE FUNCTION [dbo].[Split]
( @Delimiter varchar(5),
@List varchar(8000)
)
RETURNS @TableOfValues table
( RowID smallint IDENTITY(1,1),
[Value] varchar(50)
[code]....
View 7 Replies
View Related
Jan 29, 2015
Is it possible to pass multiple values to a TVF, such as using an IN clause?
View 6 Replies
View Related
May 12, 2015
I've to write a function to return a comma delimited values from a table columns
If a table has Tab1 ( Col1,Col2,Col3).
E.g. as below ( the columnName content I want to use as columns for my pivot table
CREATE FUNCTION [RPT].[GetListOfCol]
(
@vCat NVARCHAR(4000)
)
RETURNS @PList
AS
BEGIN
SELECT @PList += N', [' + [ColumnName] +']'
FROM [ETL].[TableDef]
WHERE [IsActive] = 1
AND [Category] = @vCat
RETURN;
END;
I want out put to be as below, I am getting this output from the select query independently by declaring @Plist variable and passing @vcat value, now I want it to be returned from a function when called from a select query output ,Colum1,column2,....
View 13 Replies
View Related
Feb 23, 2007
I have a DTSX package which reads values from a fixed-length text file using a data reader and writes some of the column values from the file to an Oracle table. We have used this DTSX several times without incident but recently the process started inserting NULL values for some of the columns when there was a valid value in the source file. If we extract some of the rows from the source file into a smaller file (i.e 10 rows which incorrectly returned NULLs) and run them through the same package they write the correct values to the table, but running the complete file again results in the NULL values error. As well, if we rerun the same file multiple times the incidence of NULL values varies slightly and does not always seem to impact the same rows. I tried outputting data to a log file to see if I can determine what happens and no error messages are returned but it seems to be the case that the NULL values occur after pulling in the data via a Data Reader. Has anyone seen anything like this before or does anyone have a suggestion on how to try and get some additional debugging information around this error?
View 12 Replies
View Related
Dec 9, 2013
I have SQL Server 2012 SSIS. I have Excel source and OLE DB Destination.I have problem with importing CustomerSales column.CustomerSales values like 1000.00,2000.10,3000.30,NotAvailable.So I have decimal values and nvarchar mixed in on Excel column. This is requirement for solution.However SSIS reads only numeric values correctly and nvarchar values are set as Null. Why?
CREATE TABLE [dbo].[Import_CustomerSales](
 [CustomerId] [nvarchar](50) NULL,
 [CustomeName] [nvarchar](50) NULL,
 [CustomerSales] [nvarchar](50) NULL
) ON [PRIMARY]
View 5 Replies
View Related
Mar 29, 2006
Hi
can somebody explain me how I can assign a NULL value to a datetime type field in the script transformation editor in a data flow task.
In the script hereunder, Row.Datum1_IsNull is true, but still Row.OutputDatum1 will be assigned a value '0001-01-01' which generates an error (not a valid datetime). All alternatives known to me (CDate("") or Convert.ToDateTime("") or Convert.ToDateTime(System.DBNull.Value)) were not successful.
Leaving out the ELSE clause generates following error: Error: Year, Month, and Day parameters describe an un-representable DateTime.
If Not Row.Datum1_IsNull Then
Row.OutputDatum1 = Row.Datum1
Else
Row.OutputDatum1 = CDate(System.Convert.DBNull)
End If
Any help welcome.
View 1 Replies
View Related
Nov 9, 2000
Hi,
My query "select blah, blah, rank from tablewithscores" will return results that can legitimately hold nulls in the rank column. I want to order on the rank column, but those nulls should appear at the bottom of the list
e.g.
Rank Blah Blah
1 - -
2 - -
3 - -
NULL - -
NULL - -
At present the NULLs are at the top of the list, but I do not want my ranking in descending order. Any suggestions?
Thanks
Dan
View 1 Replies
View Related
Sep 22, 2007
Hi,
Can anybody help me with the following problem:
I have Vista Ultimate installed and within Vista .NET Framework 3.0 is installed as a part of the operating system so I can't remove 3.0
Now for MS SQL Server 2005 Express I need .NET Framework 2.0 and the SQL Server 2005 doesn't work with .NET Framework 3.0
Can't install 2.0, get the message that 3.0 is already installed.
Please help me!!
René
View 5 Replies
View Related
Sep 3, 2015
I have an SSIS package that imports data from an Excel file, replaces any value in Excel that reads "NULL" to "", then writes the data to a couple of databases.
What I have discovered today, is I have two columns of dates, an admit date and discharge date column, and what I need to do is anywhere I have a null value in the discharge date column, I have to replace it with the value in the admit date column.Â
I have searched around online and tried a few things using the Replace funtion in Derived columns but no dice so far.Â
View 3 Replies
View Related
May 6, 2014
I have 2 identical tables one contains current settings, the other contains all historical settings.I could create a union view to display the current values from table A and all historical values from table B, butthat would also require a Variable to hold the tblid for both select statements.
Q. Can this be done with one joined or conditional select statement?
DECLARE @tblid int = 501
SELECT 1,2,3,4,'CurrentSetting'
FROM TableA ta
WHERE tblid = @tblid
UNION
SELECT 1,2,3,4,'PreviosSetting'
FROM Tableb tb
WHERE tblid = @tblid
View 9 Replies
View Related
Oct 28, 2015
How the code inserted works.....I am trying to do the same thing with
GetProcesses
So I want to insert into a table the results of all the processes on a server and determine if a process/service is running.......
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.IO;
using System.Collections;
[Code] .....
View 8 Replies
View Related
May 27, 2015
I want to create a CLR Stored Procedure with a Table User Defined Type like this short example in SQL:
CREATE TYPE [dbo].[TypeTable] AS TABLE
(
[Id] [integer] NOT NULL,
[Value] [sysname] NOT NULL,
PRIMARY KEY CLUSTERED
[Code] ....
I found some example in this link : CLR UDT
But I can't figure how to do the same with a User Defined Type Table.
View 5 Replies
View Related
Jul 26, 2014
I am relatively new to SQL and as a project I have been asked to create the SQL for a simple database to record train details. I want to implement a check constraint which will prevent data from being inserted into a table if the weight of the train is more than the maximum towing weight of the locomotive. FOr instance, I need to add the unladen weight and maximum capacity of each wagon (located in the wagon type table) and compare it against the locomotive maximum pulling weight (the locomotive class table). I have the following SQL but it will not work:
check((select SUM(fwt.unladen_weight+fwt.maximum_payload) from
hauls as h,freight_wagon as fw,freight_wagon_type as fwt,train as t where
h.freight_wagon_serial_number = fw.freight_wagon_serial_number and
fw.freight_wagon_type = fwt.freight_wagon_type and
h.train_number = t.train_number) <
(select lc.maximum_towing_weight from locomotive_class as lc,locomotive as l,train as t where
lc.locomotive_class = l.locomotive_class and l.locomotive_serial_number = t.locomotive_serial_number))
The hauls table is where the constraint has been placed and is the intermediary table between train and freight wagon.
I may not have explained this very well; but in short, i need to compare the sum of two values in one table against a values located in another table...At present I keep getting a message telling me the sub query cannot return more than one row.
View 2 Replies
View Related
