Referencing A Custom Column
Feb 27, 2008
Excuse me if my terminlogy is inaccurate, i'm a .NETer that's new to SQL.
I was wondering if it's possible to reference a column in the WHERE CLAUSE that has been customily defined in the SELECT statement
for example
select employeeID, case when JobCode = 'A' then 'Accountant'
case when JobCode = 'C' then 'Consultant'
case when JobCode = 'B' then 'Biller'
End as JobType
from Employee
where JobType is not null
This does not work, and saids JobType is an invalid column name. Basically, what I want is to display the jobtype of the employee but i also want to only display the employees that are Accountants, consultants and billers.
Is this possible and what would be the best way of doing this?
I do not seem to be about to reference JobType in the WHERE statement.
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Feb 27, 2008
Excuse me if my terminlogy is inaccurate, i'm a .NETer that's new to SQL.
I was wondering if it's possible to reference a column in the WHERE CLAUSE that has been customily defined in the SELECT statement
for example
select employeeID, case when JobCode = 'A' then 'Accountant'
case when JobCode = 'C' then 'Consultant'
case when JobCode = 'B' then 'Biller'
End as JobType
from Employee
where JobType is not null
This does not work, and saids JobType is an invalid column name. Basically, what I want is to display the jobtype of the employee but i also want to only display the employees that are Accountants, consultants and billers.
Is this possible and what would be the best way of doing this?
I do not seem to be about to reference JobType in the WHERE statement.
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Jul 24, 2006
Is there a way you can reference a prebuilt CLR function in a custom dataflow task?
The CLR and the custom dataflow task are one in the same. The reason that I'm designing the custom task is that I find that it's time consuming to make a call to the database to retrieve a function to work on something that's already in memory. Also, another reason is that if the code needs to be updated, it doesn't have to be done in 2 places allowing for less confusion.
I tried adding a reference to the CLR function in my SSIS dataflow task, but when I try running it in SSIS, I get the error saying it cannot use a SQL CLR defined task in the package which I believe is due to this reference in the CLR code:
[Microsoft.SqlServer.Server.SqlFunction]
public static string toCase(string text, string caseType)
Is there a way to circumvent the [...SqlFunction] line of code when the DLL is referenced by an SSIS dataflow task, or do I just have to deal with having 2 copies of the same code?
Thanks in advance!
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Oct 16, 2006
Hi all,
The requirement is to have a table say 'child_table', with an Identity column to refer another column from a table say 'Parent_table'..
i cannot implement this constraint, it throws the error when i execute the below Alter query,
ALTER TABLE child_table ADD CONSTRAINT fk_1_ct FOREIGN KEY (child_id)
REFERENCES parent_table (parent_id) ON DELETE CASCADE
the error thrown is :
Failed to execute alter table query: 'ALTER TABLE child_table ADD CONSTRAINT
fk_1_ct FOREIGN KEY (child_id) REFERENCES parent_table (parent_id) ON DELETE
CASCADE '. Message: java.sql.SQLException: Cascading foreign key 'fk_1_ct' cannot be
created where the referencing column 'child_table.child_id' is an identity column.
any workarounds for this ?
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Jun 15, 2006
For example, the table below, has a foreign key (ManagerId) that points to EmployeeId (primary key) of the same table.
-------Employees table--------
EmployeeID . . . . . . . . . . int
Name . . . . . . . . . . . nvarchar(50)
ManagerID . . . . . . . . . . . int
If someone gave you an ID of a manager, and asked you to get him all employee names who directly or indirectly report to this manager.
How can that be achieved?
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Aug 31, 2000
I receive the following error when creating a CHECK constraint that references another column. According to the good old Wrox SQL Server book, I'm using the correct syntax. Anyone have any ideas???
Thanks in advance!
Server: Msg 8141, Level 16, State 1, Line 1
Column CHECK constraint for column 'end_date' references another column, table 'Session'.
Here's an example of the script that I'm using:
CREATE TABLE Session (
session_key char(18) NOT NULL,
course_key char(18) NOT NULL,
site_key char(18) NOT NULL,
instructor_key char(18) NOT NULL,
start_date smalldatetime NULL,
end_date smalldatetime NULL
CHECK (end_date >= start_date)
)
.
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Oct 26, 2013
I'm encountering this very weird problem, so I create a staff table:
CREATE TABLE Staff (
staffNo numeric(10),
venueNo numeric(10),
name nvarchar(20),
DOB datetime,
position nvarchar(20),
salary numeric(8,2)
CONSTRAINT staff_PK PRIMARY KEY(staffNo, venueNo),
CONSTRAINT venue_FK FOREIGN KEY(venueNo) REFERENCES Venue
);
and then when I create a professional therapist table
CREATE TABLE Professional_Therapist (
staffNo numeric(10),
specialization nvarchar(20),
bonus numeric(8,2),
CONSTRAINT professional_PK PRIMARY KEY(staffNo),
CONSTRAINT staff_FK FOREIGN KEY(staffNo) REFERENCES Staff
);
It says : The number of columns in the referencing column list for foreign key 'staff_fk' does not match those of the primary key in the referenced table 'Staff'.
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Feb 15, 2008
Hi everybody,
I know that it is possible for one column to reference two different parent tables by defining two foreign keys on a same column, I have done it and SQL Server does give any error. But I want to know that is it advisable to define multiple foreign key on a column referncing two differnt parent table's primary key in differnt case... ? Means If Case 1 then It should reference to column1 or table1 otherwise it should reference to table2? How is it practicle...?
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Apr 23, 2006
Hello All
I have the following problem running an sp with a table variable (sql server 2000) - the error which occurs at the end of the query is: "must declare the variable @THeader" . @THeader is the name of the variable table and the error occurs with such references as @THeader.ApplyAmt, @THeader.TransactionHeaderID, etc.
declare @THeader TABLE (
TransactionHeaderID [int] NOT NULL ,
PatientID [int] NOT NULL ,
TransactionAllocationAmount [money] NOT NULL ,
ApplyAmt [money] NULL ) - create table variable
insert into @THeader select TransactionHeaderID,PatientID,TransactionAllocationAmount,ApplyAmt from mtblTransactionHeader where PatientID = 9 - fill the table variable
UPDATE @THeader
set TransactionAllocationAmount =
(SELECT isnull(Sum(mtblTransactionAllocation.Amount),0)
FROM mtblTransactionAllocation where mtblTransactionAllocation.DRID = TransactionHeaderID or
mtblTransactionAllocation.CRID = TransactionHeaderID) from @THeader, mtblTransactionAllocation - do the updates on the table variable
Update @THeader
set ApplyAmt = (SELECT mtblTransactionAllocation.Amount
FROM mtblTransactionAllocation where mtblTransactionAllocation.DRID = TransactionHeaderID and
mtblTransactionAllocation.CRID = 187 and PatientID = 9) from @THeader, mtblTransactionAllocation - do the updates on the table variable
- below is where the problems occur. It occurs with statements referencing columns in the table variable, i.e. @THeader.ApplyAmt
UPDATE mtblTransactionHeader
SET mtblTransactionHeader.TransactionAllocationAmount = @THeader.TransactionAllocationAmount,
mtblTransactionHeader.ApplyAmt = @THeader.ApplyAmt
FROM @THeader, mtblTransactionHeader
WHERE @THeader.TransactionHeaderID = mtblTransactionHeader.TransactionHeaderID - put the values back into original table
Thanks in advance
smHaig
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Aug 25, 2006
Any ideas how can I pass date range values from the where clause of an outer query to the inner correlated subquery ... without using a stored procedure because I am using Report Builder?
Using the simplified sql below I need the average freight charge between the dates for all of the ShipCountry's orders. (I have hard coded the dates for demo purposes only as it is these that I need referenced from the outer query's where clause.)
select
OrderDate,
ShipCountry,
ShipCity,
Freight,
/* how do I get to the outer query's date range ? */
(SELECT AVG(Freight) FROM Orders WHERE ShipCountry = O.ShipCountry AND OrderDate between '01-jan-1997' and '01-jan-2000') AS CountryAverageFreight
from
Northwind.dbo.Orders O
where
ShipCity = 'Paris' and OrderDate between '01-jan-1997' and '01-jan-2000'
Thanks
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Sep 5, 2007
Hi all,
I have a table with 3 computed columns, the first two reference a function for there value. The last computed column should be total of the other computed columns, however when trying to write the formula for this column SQL Server rejects it.
Am i correct in thinking it is not possible to reference other computed columns in a computed column's forumla.
My current work around is to call the functions again that the other computed columns use to generate the total, though this seems to me like a performance issue.
Could anyone offer some advise on my situation.
Any input apreciated.
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Dec 13, 2007
Hi,
I am reading data from a Excel file. The first Row in the Excel file are the column names. The first row is a Time value. The other rows are only numeric values.
Sample of Excel File:
Timestamp SourceColumn1 SourceColumn2
12/12/2007 12:00 AM 30 20.4
12/12/2007 01:00 PM 35 21.2
12/12/2007 02:00 PM 32 22.5
.
.
.
What I now have to do is to extract the numeric values for every column and write the value at each row at the timestamp (given in the first column) to a database.
This means I have to run a SQL command on every column and every row.
Example:
#Processing Row 1
INSERT INTO Table VALUES (destinationcolumn1, destinationcolumn2, timestamp) VALUES (sourcecolumn1, valueatcurrentrow, timestampatcurrentrow)
INSERT INTO Table VALUES (destinationcolumn1, destinationcolumn2, timestamp) VALUES (sourcecolumn2, valueatcurrentrow, timestampatcurrentrow)
#Processing Row 2
INSERT INTO Table VALUES (destinationcolumn1, destinationcolumn2, timestamp) VALUES (sourcecolumn1, valueatcurrentrow, timestampatcurrentrow)
.
.
.
Does anyone know how to implement this in Integration Services?
Regards
Johannes.W
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Mar 8, 2007
Hi,
I am creating a custom transformation component, and a custom user interface for that component.
In
my custom UI, I want to show the custom properties, and allow users to
edit these properties similar to how the advanced editor shows the
properties.
I know in my UI I need to create a "Property Grid".
In
the properties of this grid, I can select the object I want to display
data for, however, the only objects that appear are the objects that I
have already created within this UI, and not the actual component
object with the custom properties.
How do I go about getting the properties for my transformation component listed in this property grid?
I am writing in C#.
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May 14, 2014
creating a custom column that will put a list of 5 values for each unique value(or in this case Employee).
So I have a Employee table were I pull a list of all active employees -
Example -
024Swanson, Ronrswanson@tv.com
026Donaughy, Jackjdonaughy@tv.com
028Scott, Michaelsmichael@tv.com
What I want to do is add a column that has 5 values and create a row for each value
I want it too look like this -
024Swanson, Ronrswanson@tv.com a
024Swanson, Ronrswanson@tv.com b
024Swanson, Ronrswanson@tv.com c
024Swanson, Ronrswanson@tv.com d
024Swanson, Ronrswanson@tv.com e
[Code] ....
Currently all my query looks like is this -
SELECT EmpID, LastFirst, Email
FROM dbo.EmpList
WHERE (Active = 1)
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May 22, 2008
We are developing a batabase which is meant for financial domain,so it will import data from different source system..
and data from our data base will be further passed to other applications.
In contex of our system integration with other data sources ,whether is it a good idea to have a auto integer primary key a or to implement some logic to generate primary key?
Can some one guide us to some pratical data base design case studies?or some best practices.?
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Feb 7, 2006
Does anyone know how to get destination coulmns to show up in the advanced editor for a custom component? I have a custom flat file destination component that builds the output based on a specific layout. It works as long as the upstream column names match my output names. What I want is to allow non-matching columns to be mapped by the user as they can in a stock flat file destination. The closest that I have been able to come is to get the "column mappings" tab to show up and populate the "Available Input Columns" by setting ExternalmetadataColumnCollection.IsUsed to true on the input. The problem is that the "Available destination columns" box is always empty. I have tried the IsUsed property on the output and pretty much every other property that I could find. On the Input and Output properties all of my columns show up under the output as both External and Output columns. Is there a separate collection for "destination" columns that I can't find? It's getting a little frustrating, is this something that can be done or do I have to write a custom UI to make it happen?
Thanks!
Harry
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Jun 29, 2006
I'm building a custom component and UI and am a bit confused on where I
need to create and/or set custom column
properties?
My UI will have a datagrid with three
columns: 1) a check box to select a column for use by the component, 2)
the input column name, and 3) a "differentiator" checkbox that indicates
an extra property about some of the columns that have the first column
checkbox checked (For example, my component may be using five input columns, but
three of those need to be used in a slightly different
way.)
The problem is, I don't understand when or
where I'm supposed to create the custom property for the input
column. SetUsageType is where I've been thinking, but I don't
know if I'm supposed to be creating it for an input column or a virtual
input column. I'd appreciate any guidance.
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Aug 14, 2007
This is trivial I'm sure but I'll be dogged if I can find someone who mentions how to do it. I am attempting to develop a Data Flow Transformation that appends a new column (a string value) into the current stream.
I have found plenty of references on how to replace an existing column but I'd really like to just add my new column in there. It doesn't need to be configurable, it can be a static column name. I'll take a solution that allows the column name to be set at design time, don't get me wrong but the magic I'm looking for is how to implement a new column in a stream.
Yes, I am well aware of the derived column task but I will be replacing a few hundred instances and I'd much rather just drag an item onto the designer than to drag a derived column, double click it, type in the column name, set the expression and then set the datatype, etc.
Anyone spare a moment to enlighten me?
Pardon the lack of formatting, this BB doesn't play with Opera (I know, I'm a heretic)
using System;
using System.Collections;
using System.Runtime.InteropServices;
using Microsoft.SqlServer.Dts.Pipeline;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;
using Microsoft.SqlServer.Dts.Runtime;
namespace Microsoft.Samples.SqlServer.Dts
{
[
DtsPipelineComponent
(
DisplayName = "Nii",
Description = "This is the component that says Nii.",
ComponentType = ComponentType.Transform
)
]
public class Nii : PipelineComponent
{
public override void ProcessInput(int inputID, PipelineBuffer buffer)
{
if (!buffer.EndOfRowset)
{
while (buffer.NextRow())
{
try
{
// do something here to
}
catch (Exception e)
{
ComponentMetaData.FireInformation(0, ComponentMetaData.Name, "There was an error on row " + buffer.CurrentRow.ToString() + ". The error is: " + e.Message + " : " + e.Source + " : " + e.StackTrace, "", 0, ref fireEventAgain);
}
}
}
}
}
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Feb 9, 2006
Hi,
I am building a custom component have a IDTSCustomProperty90 property that can take the value 'True' or 'False'.
Depending on its setting, I want to include (or not include) a column in the output.
Any advice on how to go about doing this (with some sample code) would be much appreciated!
Here's how I'm declaring the property in ProvideComponentProperties()
IDTSCustomProperty90 IncludeErrorDesc = ComponentMetaData.CustomPropertyCollection.New();
IncludeErrorDesc.ExpressionType = DTSCustomPropertyExpressionType.CPET_NONE;
IncludeErrorDesc.Name = "Some Name";
IncludeErrorDesc.TypeConverter = typeof(Boolean).AssemblyQualifiedName;
IncludeErrorDesc.Value = Convert.ToBoolean(false);
Thanks in advance
-Jamie
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Aug 12, 2015
I want to add a custom column in a select statement that has a value to true or false based on other criteria.
SELECT [ID], [Name], [Description], [EmpID], [Employed] FROM [Employees]
Now, in the above example there is no [Employed] Column in my table but I want it to show true or false based on whether or not [EmpID] equals a certain value.
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Dec 22, 2006
Hi,
I want to recalculate some columns in a custom component, due to a formula using a single column as factor. What will be the best way to let the user choose the single column (factor) beneath the columns to work with.
Is there a way to use customproperties other than strings. DropDowns for example. If so, do you know a tutorial oder code snippet?
Thanks
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Feb 21, 2007
I'm building a custom transform component. I want to mark some input columns as keys for deduplicating. In a similar way to the provided Sort component, I want to check those columns and allow pass-throughs (or not) for the others - so next to each input column name I need two checkboxes (1:use for dedupe; 2:include in output if 1 not checked). If a column is checked for use in the dedupe, I want some other attributes to be shown indicating how it will be used. How do I display the checkboxes to let users select which columns to include for deduplication, and then how do I add further attributes underneath (copying the Sort component's look) for selection?
Thanks in advance for guidance and pointers on this.
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Mar 13, 2006
A month or so ago I instigated this thread- http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=243117&SiteID=1 which talked about how to conditionally add a column to my component depending on the value of a custom property. If the custom property is TRUE then the column should appear in the output (and vice versa).
Bob Bojanic said I should use the SetComponentProperty() method to do this and that is working pretty well. However, it bothers me that SetComponentProperty() could be called, the column will then be added, and then the package developer could press 'Cancel'. In this instance the value of my custom property would be inconsistent with the presence of the extra column.
How do you get around that?
Thanks
Jamie
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Jun 3, 2015
Is it possible to do custom sort for a Column Group?
i.e. if the columns are coming out as A B C, is it possible to change it B C A (or anything else).
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Feb 16, 2007
When data is imported from our legacy system, the same functions need to be applied to several columns on different tables. I want to build a kind of "Function Library", so that the functions I define can be re-used for columns in several packages.
The "Derived Column" transform seems ideal, if only I could add my list of user-defined functions to it. Basically I want to inherit from it, and add my own list of functions for the users to select.
Is this possible ?
What other approaches could I take to building about 30 re-usable functions?
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Jun 26, 2006
Would anyone happen to have any pointers or know of any good code examples to either programmatically change the type of an input column when it is passed through the component, or add a new column to the output? I am extracting data from an Oracle database which is in Julian date format (represented within SSIS as a DT_NUMERIC column) and I need to to either transform the input column holding it into a date column, or to dynamically add a new output column holding the transformed data.
Many thanks
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Feb 7, 2007
Hi,
I'm having my first go at developing a destination adapter which will send data to an update Web Service.
I've got some rather big gaps in my understanding. I've been following the various samples I've found on the net and have validated my mapping and picked up all the available column names and datatypes which are appearing in the Input and Output Properties tab of the Advanced Editor but I only have a tab for "Input Columns" and not "Column Mappings".
Which method defines the availble columns for the user to map?
Let me know if I haven't given enough information.
cheers
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Mar 28, 1999
When replicating a table which has an identity column I get the error: "Procedure cp_insert_tblname expects parameter @C1, which was not supplied.". The stored procedure appears to be called without any parameters so my insert stored procedure does not work. I know I'm missing something basic here!! Do I have to add the field names when telling replication to use a custom stored procedure. If not, how do arguments get passed to my SP, as globals somehow?
Any info greatly appreciated!!
Thanks,
Jay
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Aug 17, 2015
I'm writing a custom source component that reads data from a SharePoint list with dynamic mapping to output columns. It's my first custom component and it's based on several samples and tutorials from Internet
Output columns are not created by the component itself, they must be added by user at design time. The component makes dynamically an association between SharePoint fields and available output columns at run-time (based on an mapping table).
I made a very basic skeleton and I encounter a problem when I add a column to output: it has no datatype and when I try to set one I have an the error Property value is not valid, The component xxxxxx does not allow setting output column datatype properties.
Imports System
Imports Microsoft.SqlServer.Dts.Pipeline
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper
<DtsPipelineComponent(ComponentType:=ComponentType.SourceAdapter,
DisplayName:="SharePoint Dynamic Assoc List Source",
[Code] ....
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Aug 14, 2007
Hi,
I've created a Custom Data Flow Component and added some Custom Properties.
I want the user to set the contents using an expression. I did some research and come up with the folowing:
Code Snippet
IDTSCustomProperty90 SourceTableProperty = ComponentMetaData.CustomPropertyCollection.New();
SourceTableProperty.ExpressionType = DTSCustomPropertyExpressionType.CPET_NOTIFY;
SourceTableProperty.Name = "SourceTable";
But it doesn't work, if I enter @[System:ackageName] in the field. It comes out "@[System:ackageName]" instead of the actual package name.
I'm also unable to find how I can tell the designer to show the Expression editor. I would like to see the elipses (...) next to my field.
Any help would be greatly appreciated!
Thank you
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Apr 2, 2007
Hi,
I'm trying to enable Expression for a custom property in my custom data flow component.
Here is the code I wrote to declare the custom property:
public override void ProvideComponentProperties()
{
ComponentMetaData.RuntimeConnectionCollection.RemoveAll();
RemoveAllInputsOutputsAndCustomProperties();
IDTSCustomProperty90 prop = ComponentMetaData.CustomPropertyCollection.New();
prop.Name = "MyProperty";
prop.Description = "My property description";
prop.Value = string.Empty;
prop.ExpressionType = DTSCustomPropertyExpressionType.CPET_NOTIFY;
...
}
In design mode, I can assign an expression to my custom property, but it get evaluated in design mode and not in runtime
Here is my expression (a file name based on a date contained in a user variable):
"DB" + (DT_WSTR, 4)YEAR( @[User::varCurrentDate] ) + RIGHT( "0" + (DT_WSTR, 2)MONTH( @[User::varCurrentDate] ), 2 ) + "\" + (DT_WSTR, 4)YEAR( @[User::varCurrentDate] ) + RIGHT( "0" + (DT_WSTR, 2)MONTH( @[User::varCurrentDate] ), 2 ) + ".VER"
@[User::varCurrentDate] is a DateTime variable and is assign to 0 at design time
So the expression is evaluated as: "DB189912189912.VER".
My package contains 2 data flow.
At runtime,
The first one is responsible to set a valid date in @[User::varCurrentDate] variable. (the date is 2007-01-15)
The second one contains my custom data flow component with my custom property that was set to an expression at design time
When my component get executed, my custom property value is still "DB189912189912.VER" and I expected "DB200701200701.VER"
Any idea ?
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Jul 9, 2007
Some DB Field ID
X
2007
2008
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
A
X-A
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
B
X- A -B
1
500
10
20
0
0
0
0
0
0
0
20
50
0
100
400
25
10
10
0
0
5
0
25
15
10
10
20
130
270
2
750
10
10
10
20
20
10
10
20
10
10
10
10
150
600
20
20
20
20
30
30
10
10
10
30
30
30
260
340
3
600
All,
I am trying to achieve something as above. Basically, the Months subtotals are represented by A and B. Then (X-A) and (X-A-B) are also the subtotals at the same group level as A and B but don't simply display the total for respective years 2007 and 2008, instead those are remaning totals from X. In order to calculate the remaining totals however, one need to consider the subtotal in previous group. For example, for 2007 its X-A, but for 2008 its X-A-B. I would like to know if this can be achieved using Matrix control. If so, what would be the steps?
Thanks.
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Aug 17, 2005
What I want to accomplish is that at design time the designer can enter a value for some custom property on my custom task and that this value is accessed at executing time.
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