Trigger Not Fired
Jul 10, 2001
Hi,
I have an Access frontend and an SQL Server backend. I use a Query (in Access frontend) to insert in two tables simultaneously. I have a trigger in one of the involved table which update the foreign key in another involved table.
I've built an SQL View with exacly!!! the same syntax as my Query in Access.
And when I insert a new entry through the SQL View the trigger fires(the foreign key is updated), but when I insert through my Access Query the trigger doesn't fires (the foreign key is not updated).
Any idea ?
Thanks in advance
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Jul 20, 2005
Are there any limitations or gotchas to updating the same table whichfired a trigger from within the trigger?Some example code below. Hmmm.... This example seems to be workingfine so it must be something with my specific schema/code. We'reworking on running a SQL trace but if anybody has any input, fireaway.Thanks!create table x(Id int,Account varchar(25),Info int)GOinsert into x values ( 1, 'Smith', 15);insert into x values ( 2, 'SmithX', 25);/* Update trigger tu_x for table x */create trigger tu_xon xfor updateasbegindeclare @TriggerRowCount intset @TriggerRowCount = @@ROWCOUNTif ( @TriggerRowCount = 0 )returnif ( @TriggerRowCount > 1 )beginraiserror( 'tu_x: @@ROWCOUNT[%d] Trigger does not handle @@ROWCOUNT[color=blue]> 1 !', 17, 127, @TriggerRowCount) with seterror, nowait[/color]returnendupdate xsetAccount = left( i.Account, 24) + 'X',Info = i.Infofrom deleted, inserted iwhere x.Account = left( deleted.Account, 24) + 'X'endupdate x set Account = 'Blair', Info = 999 where Account = 'Smith'
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May 23, 2002
Hi,
We have an asp web aplication using COM on a SQL Server 2000 database. The application uses COM to perform the database access. On altering data, the code checks the @@rowcount to see if the intented insert or update was succesfull - this is done on changes in various colums in various locations in the code.
Now we need to add a trigger to update changed data into other tables. This is because we start migrating to a different data structure - while keeping most of the original code intact.
The problem is now, that the trigger beeing fired erases the @@rowcount. I can imagine others to have experienced the same problem. So, the big question is here:
Is there a solition/workaround to keep the @@rowcount on update/insert/deletes on a table evn if a trigger fires?
Thank you,
Marco van Schagen,
Crexx, the Netherlands
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Mar 4, 2008
Hi,
I've created the following trigger:
CREATE TRIGGER myTriggerServer
ON ALL SERVER
FOR CREATE_LOGIN, ALTER_LOGIN, DROP_LOGIN
AS
BEGIN
EXEC myDatabase.dbo.myProcedure
END
The trigger is NOT fired (and procedure not executed) when I create a new login or alter an existing login.
Only Drop Login fires the trigger.
Please tell if it's a problem with SQL Server 2005 or am I making some mistake here?
-Anshul
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Sep 12, 2007
if service broker is not an option, how can the trigger and sp(s) called by our trigger act asynchronously to the event that fired the trigger in the first place. We are more concerned with the original event being committed than the actions that follow via the trigger.
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Apr 19, 2006
By Database is heavily used , we use Transaction log backups ever 10 minuts, now someone fired a wrong query , that updated a particular table , the DB is still in use, there are some users working on it , I cant get the DB offline , what can I do to correct the mistake , please advice.
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Sep 25, 2006
Hi everyone,
I was wondering when events inside IDTSComponentEvents interface are called when you throw a SSIS package? I've got a private class which implements IDTSEvents and along with that got another one that implements the IDTSComponentEvents. I see how neither of them are fired when I debug the code by using F11, and I don't know what is it for.
Let me know your comments or come back to me if you need further details on that.
Thanks in advance,
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Mar 21, 2007
Is it possible to only handle the outter-most event? For example, I have an email that goes out in response to OnPreExecute and OnPostExecute, but I only want it to go out once, instead of for every tasks/object.
Thanks,
Rick
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Jan 8, 2007
Hi,
How can you get the Query Statement of the last executed SQL command.
I am not quite sure but I do remember coming across such a command ( maybe an undocumented one).
Thanks for your help and pointers.
My Best wishes for the new year to all the folks in the forum. Wishing you greater days ahead.
Warm Regards,
Ranjit S Hans.
---------------------------------------------------------------------
Everywhere is a walking distance if you have the time - Steven Wright
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Apr 16, 2014
Our company purchased a app. Is there any way to find out which store procedures were fired once a button was clicked?
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Jul 10, 2007
Hello all,
I'm trying to cath content of PRINT statements through InfoMessage event. I have subscribed on InfoMessage event through ConnectionEventsVt interface. The problem that event fired only once for statement. For example i have following T-SQL script:
Code Snippet
PRINT 'Message1'
PRINT 'Message2'
GO
PRINT 'Message3'
PRINT 'Message4'
GO
When i execute this script InfoMessage event fired twice. First time Error object Description property contains "Message1" text. Second time it contains "Message3" text.
What i'm doing wrong?
Server: MS SQL Sever 2005
OS: Windows XP SP2
IDE: Delphi 7
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Jul 17, 2007
Hi all,
I am investigating using Query Notifications - a great addition BTW. I have built a test app - loosely based on MSDN example - and am running against a SQL Express 2005 server. I have the following problem:
I have start/stop buttons to enable change checking, and a hardcode query that I am using for testing. If I stop and restart I now recieve duplicate notifcations, a single change causing the OnChange event to fires twice with two different ids Repeat this and the event will fires 3 times for each change and so on.
This only happens with a running app, if I restart the app I only get a single notification so I assume I have missed a step in stopping query notifcations or reinitialisation. I have include code below:
private bool Start()
{
try
{
// Remove any existing dependency connection, then create a new one.
SqlDependency.Stop(_currentConnectionString);
if (SqlDependency.Start(_currentConnectionString))
{
if (connection == null)
{
connection = new SqlConnection(_currentConnectionString);
}
if (command == null)
{
command = new SqlCommand(_sqlQueryString, connection);
}
return (true);
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
return false;
}
private void Stop()
{
SqlDependency.Stop(_currentConnectionString);
if (command != null)
{
command.Notification = null;
command = null;
}
if (connection != null)
{
connection.Close();
connection = null;
}
}
private void GetDataSnapshot()
{
// Empty the dataset so that there is only
// one batch of data displayed.
dataToWatch.Clear();
// Make sure the command object does not already have
// a notification object associated with it.
command.Notification = null;
// Create and bind the SqlDependency object
// to the command object.
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
using (SqlDataAdapter adapter = new SqlDataAdapter(command))
{
adapter.Fill(dataToWatch, tableName);
}
}
private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
{
// This event will occur on a thread pool thread.
// Updating the UI from a worker thread is not permitted.
// The following code checks to see if it is safe to
// update the UI.
ISynchronizeInvoke i = (ISynchronizeInvoke)this;
// If InvokeRequired returns True, the code
// is executing on a worker thread.
if (i.InvokeRequired)
{
// Create a delegate to perform the thread switch.
OnChangeEventHandler tempDelegate = new OnChangeEventHandler(dependency_OnChange);
object[] args = { sender, e };
// Marshal the data from the worker thread
// to the UI thread.
i.BeginInvoke(tempDelegate, args);
return;
}
// Remove the handler, since it is only good
// for a single notification.
SqlDependency dependency = (SqlDependency)sender;
dependency.OnChange -= dependency_OnChange;
// At this point, the code is executing on the
// UI thread, so it is safe to update the UI.
++changeCount;
lblStatus.Text = String.Format(statusMessage, changeCount);
// Add information from the event arguments to the list box
// for debugging purposes only.
//lbChanges.Items.Clear();
lbChanges.Items.Add("+++++++++++++++++");
lbChanges.Items.Add("Id: " + dependency.Id);
lbChanges.Items.Add("Info: " + e.Info.ToString());
lbChanges.Items.Add("Source: " + e.Source.ToString());
lbChanges.Items.Add("Type: " + e.Type.ToString());
// Reload the dataset that is bound to the grid.
if (e.Info != SqlNotificationInfo.Error)
this.GetDataSnapshot();
}
Thanks, Nick
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Jul 12, 2007
Hi,
Is there any way that I can know the count of queries and queries fired to the database after running a ssis package?
can any one help me out?
Thanks in advance.
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Nov 14, 2006
Hey,
I'm new to this whole SQL Server 2005 thing as well as database design and I've read up on various ways I can integrate business constraints into my database. I'm not sure which way applies to me, but I could use a helping hand in the right direction.
A quick explanation of the various tables I'm dealing with:
WBS - the Work Breakdown Structure, for example: A - Widget 1, AA - Widget 1 Subsystem 1, and etc.
Impacts - the Risk or Opportunity impacts for the weights of a part/assembly. (See Assemblies have Impacts below)
Allocations - the review of the product in question, say Widget 1, in terms of various weight totals, including all parts. Example - September allocation, Initial Demo allocation, etc. Mostly used for weight history and trending
Parts - There are hundreds of Parts which will eventually lead to thousands. Each part has a WBS element. [Seems redundant, but parts are managed in-house, and WBS elements are cross-company and issued by the Government]
Parts have Allocations - For weight history and trending (see Allocations). Example, Nut 17 can have a September 1st allocation, a September 5th allocation, etc.
Assemblies - Parts are assemblies by themselves and can belong to multiple assemblies. Now, there can be multiple parts on a product, say, an unmanned ground vehicle (UGV), and so those parts can belong to a higher "assembly" [For example, there can be 3 Nut 17's (lower assembly) on Widget 1 Subsystem 2 (higher assembly) and 4 more on Widget 1 Subsystem 5, etc.]. What I'm concerned about is ensuring that the weight roll-ups are accurate for all of the assemblies.
Assemblies have Impacts - There is a risk and opportunity impact setup modeled into this design to allow for a risk or opportunity to be marked on a per-assembly level. That's all this table represents.
A part is allocated a weight and then assigned to an assembly. The Assemblies table holds this hierarchical information - the lower assembly and the higher one, both of which are Parts entries in the [Parts have Allocations] table.
Therefore, to ensure proper weight roll ups in the [Parts have Allocations] table on a per part-basis, I would like to check for any inserts, updates, deletes on both the [Parts have Allocations] table as well as the [Assemblies] table and then re-calculate the weight roll up for every assembly. Now, I'm not sure if this is a huge performance hog, but I do need to keep all the information as up-to-date and as accurate as possible. As such, I'm not sure which method is even correct, although it seems an AFTER DML trigger is in order (from what I've gathered thus far). Keep in mind, this trigger needs to go through and check every WBS or Part and then go through and check all of it's associated assemblies and then ensure the weights are correct by re-summing the weights listed.
If you need the design or create script (table layout), please let me know.
Thanks.
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Dec 5, 2006
This Audit Trigger is Generic (i.e. non-"Table Specific") attach it to any tabel and it should work. Be sure and create the 'Audit' table first though.
The following code write audit entries to a Table called
'Audit'
with columns
'ActionType' //varchar
'TableName' //varchar
'PK' //varchar
'FieldName' //varchar
'OldValue' //varchar
'NewValue' //varchar
'ChangeDateTime' //datetime
'ChangeBy' //varchar
using System;
using System.Data;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;
public partial class Triggers
{
//A Generic Trigger for Insert, Update and Delete Actions on any Table
[Microsoft.SqlServer.Server.SqlTrigger(Name = "AuditTrigger", Event = "FOR INSERT, UPDATE, DELETE")]
public static void AuditTrigger()
{
SqlTriggerContext tcontext = SqlContext.TriggerContext; //Trigger Context
string TName; //Where we store the Altered Table's Name
string User; //Where we will store the Database Username
DataRow iRow; //DataRow to hold the inserted values
DataRow dRow; //DataRow to how the deleted/overwritten values
DataRow aRow; //Audit DataRow to build our Audit entry with
string PKString; //Will temporarily store the Primary Key Column Names and Values here
using (SqlConnection conn = new SqlConnection("context connection=true"))//Our Connection
{
conn.Open();//Open the Connection
//Build the AuditAdapter and Mathcing Table
SqlDataAdapter AuditAdapter = new SqlDataAdapter("SELECT * FROM Audit WHERE 1=0", conn);
DataTable AuditTable = new DataTable();
AuditAdapter.FillSchema(AuditTable, SchemaType.Source);
SqlCommandBuilder AuditCommandBuilder = new SqlCommandBuilder(AuditAdapter);//Populates the Insert command for us
//Get the inserted values
SqlDataAdapter Loader = new SqlDataAdapter("SELECT * from INSERTED", conn);
DataTable inserted = new DataTable();
Loader.Fill(inserted);
//Get the deleted and/or overwritten values
Loader.SelectCommand.CommandText = "SELECT * from DELETED";
DataTable deleted = new DataTable();
Loader.Fill(deleted);
//Retrieve the Name of the Table that currently has a lock from the executing command(i.e. the one that caused this trigger to fire)
SqlCommand cmd = new SqlCommand("SELECT object_name(resource_associated_entity_id) FROM
ys.dm_tran_locks WHERE request_session_id = @@spid and resource_type = 'OBJECT'", conn);
TName = cmd.ExecuteScalar().ToString();
//Retrieve the UserName of the current Database User
SqlCommand curUserCommand = new SqlCommand("SELECT system_user", conn);
User = curUserCommand.ExecuteScalar().ToString();
//Adapted the following command from a T-SQL audit trigger by Nigel Rivett
//http://www.nigelrivett.net/AuditTrailTrigger.html
SqlDataAdapter PKTableAdapter = new SqlDataAdapter(@"SELECT c.COLUMN_NAME
from INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE c
where pk.TABLE_NAME = '" + TName + @"'
and CONSTRAINT_TYPE = 'PRIMARY KEY'
and c.TABLE_NAME = pk.TABLE_NAME
and c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME", conn);
DataTable PKTable = new DataTable();
PKTableAdapter.Fill(PKTable);
switch (tcontext.TriggerAction)//Switch on the Action occuring on the Table
{
case TriggerAction.Update:
iRow = inserted.Rows[0];//Get the inserted values in row form
dRow = deleted.Rows[0];//Get the overwritten values in row form
PKString = PKStringBuilder(PKTable, iRow);//the the Primary Keys and There values as a string
foreach (DataColumn column in inserted.Columns)//Walk through all possible Table Columns
{
if (!iRow[column.Ordinal].Equals(dRow[column.Ordinal]))//If value changed
{
//Build an Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "U";//U for Update
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = dRow[column.Ordinal].ToString();
aRow["NewValue"] = iRow[column.Ordinal].ToString();
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the entry
}
}
break;
case TriggerAction.Insert:
iRow = inserted.Rows[0];
PKString = PKStringBuilder(PKTable, iRow);
foreach (DataColumn column in inserted.Columns)
{
//Build an Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "I";//I for Insert
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = null;
aRow["NewValue"] = iRow[column.Ordinal].ToString();
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the Entry
}
break;
case TriggerAction.Delete:
dRow = deleted.Rows[0];
PKString = PKStringBuilder(PKTable, dRow);
foreach (DataColumn column in inserted.Columns)
{
//Build and Audit Entry
aRow = AuditTable.NewRow();
aRow["ActionType"] = "D";//D for Delete
aRow["TableName"] = TName;
aRow["PK"] = PKString;
aRow["FieldName"] = column.ColumnName;
aRow["OldValue"] = dRow[column.Ordinal].ToString();
aRow["NewValue"] = null;
aRow["ChangeDateTime"] = DateTime.Now.ToString();
aRow["ChangedBy"] = User;
AuditTable.Rows.InsertAt(aRow, 0);//Insert the Entry
}
break;
default:
//Do Nothing
break;
}
AuditAdapter.Update(AuditTable);//Write all Audit Entries back to AuditTable
conn.Close(); //Close the Connection
}
}
//Helper function that takes a Table of the Primary Key Column Names and the modified rows Values
//and builds a string of the form "<PKColumn1Name=Value1>,PKColumn2Name=Value2>,......"
public static string PKStringBuilder(DataTable primaryKeysTable, DataRow valuesDataRow)
{
string temp = String.Empty;
foreach (DataRow kColumn in primaryKeysTable.Rows)//for all Primary Keys of the Table that is being changed
{
temp = String.Concat(temp, String.Concat("<", kColumn[0].ToString(), "=", valuesDataRow[kColumn[0].ToString)].ToString(), ">,"));
}
return temp;
}
}
The trick was getting the Table Name and the Primary Key Columns.
I hope this code is found useful.
Comments and Suggestion will be much appreciated.
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Oct 30, 2007
Table 1
First_Name
Middle_Name
Surname
John
Ian
Lennon
Mike
Buffalo
Tyson
Tom
Finney
Jones
Table 2
ID
F
M
S
DOB
1
Athony
Harold
Wilson
24/4/67
2
Margaret
Betty
Thathcer
1/1/1808
3
John
Ian
Lennon
2/2/1979
4
Mike
Buffalo
Tyson
3/4/04
5
Tom
Finney
Jones
1/1/2000
I want to be able to create a trigger that updates table 2 when a row is inserted into table 1. However I€™m not sure how to increment the ID in table 2 or to update only the row that has been inserted.
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Feb 5, 2008
A
ID
Name
1
Joe
2
Fred
3
Ian
4
Bill
B
ID
1
4
I want to be able to create a trigger so that when a row is inserted into table A by a specific user then the ID will appear in table B. Is it possible to find out the login id of the user inserting a row?
I believe the trigger should look something like this:
create trigger test_trigger
on a
for insert
as
insert into b(ID)
select i.id
from inserted i
where
--specific USER
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Mar 18, 2008
how to create new CLR trigger from existing T-Sql Trigger Thanks in advance
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Jul 23, 2005
When a row gets modified and it invokes a trigger, we would like to beable to update the row that was modified inside the trigger. This is(basically) how we are doing it now:CREATE TRIGGER trTBL ON TBLFOR UPDATE, INSERT, DELETEasupdate TBLset fld = 'value'from inserted, TBLwhere inserted.id= TBL.id....This work fine but it seems like it could be optimized. Clearly we arehaving to scan the entire table again to update the row. But shouldn'tthe trigger already know which row invoked it. Do we have to scan thetable again for this row or is their some syntax that allows us toupdate the row that invoked the trigger. If not, why. It seems likethis would be a fairly common task. Thanks.
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Jul 20, 2005
Salve, non riesco a disabilitare un trigger su sqlserver nè da queryanalyzer, nè da enterprise manager.In pratica tal cosa riuscivo a farla in Oracle con TOAD, mentre qui nonriesco.Mi interessa disattivarlo senza cancellarlo per poi riattivarlo al bisognosenza rilanciare lo script di creazione.Grazie a tuttiHi I need to disable a DB trigger and I'm not able to do this neither withquery analyzer, neither with enterprise manager.I remeber this job was quite simple using TOAd in Oracle.I'm interested in making it disabled not delete it, without run creationscript.Thanks a lot to everybody.
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May 30, 2008
Hi,
I am not sure if this is the right forum to post this question.
I run an update statement like "Update mytable set status='S' " on the SQL 2005 management Studio.
When I run "select * from mytable" for a few seconds all status = "S". After a few seconds all status turn to "H".
This is a behaviour when you have an update trigger for the table. But I don't see any triggers under this table.
What else would cause the database automatically change my update?
Could there be any other place I should look for an update trigger on this table?
Thanks,
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Sep 20, 2007
Hi all in .net I've created an application that allows creation of triggers, i also want to allow the deletion of triggers.
The trigger name is kept in a table, and apon deleting the record i want to use the field name to delete the trigger
I have the following Trigger
the error is at
DROP TRIGGER @DeleteTrigger
I'm guessing it dosen't like the trigger name being a variable instead of a static name
how do i get around this?
thanks in advance
-- ================================================
-- Template generated from Template Explorer using:
-- Create Trigger (New Menu).SQL
--
-- Use the Specify Values for Template Parameters
-- command (Ctrl-Shift-M) to fill in the parameter
-- values below.
--
-- See additional Create Trigger templates for more
-- examples of different Trigger statements.
--
-- This block of comments will not be included in
-- the definition of the function.
-- ================================================
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
CREATE TRIGGER RemoveTriggers
ON tblTriggers
AFTER DELETE
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
Declare @DeleteTrigger as nvarchar(max)
select @DeleteTrigger = TableName FROM DELETED
IF OBJECT_ID (@DeleteTrigger,'TR') IS NOT NULL
DROP TRIGGER @DeleteTrigger
GO
END
GO
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Jan 23, 2008
Hi,
I have a trigger set on TABLE1 so that any update to this column should set off trigger to write to the AUDIT log table, it works fine otherwise but not the very first time when table1 has null in the column. if i comment out
and i.req_fname <> d.req_fname from the where clause then it works fine the first time too. Seems like null value of the column is messing things up
Any thoughts?
Here is my t-sql
Insert into dbo.AUDIT (audit_req, audit_new_value, audit_field, audit_user)
select i.req_guid, i.req_fname, 'req_fname', IsNull(i.req_last_update_user,@default_user) as username from inserted i, deleted d
where i.req_guid = d.req_guid
and i.req_fname <> d.req_fname
Thanks,
leo
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Mar 3, 2008
I have trigger, but not execute somedata because insert few row in every second. I use java to insert data to SQL server 2005. Data inserted to a table but not executing trigger for some data.
For example 100 data every second inserted to a table.
If insert data one by one to a table trigger fires success.
Please Help me.
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Jun 17, 2006
There are two different Stored Procedures insert data into a table, is it possible to catch what stored procedure name was that trigged the trigger in the trigger?
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Jul 26, 2006
Hi, I am trying to script a trigger on a table to accomplish the following... If a row is updated then the value in the 'date' column in that specific row would update to getDate().
I have never created a trigger before and finding it very difficult. Thank you very much in advance.
Kind Regards,
Sean.
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Feb 4, 2007
Hello
I am having difficulty try to get a trigger to work.
I need to create a trigger querie that will insert a row from TableMain (Column LNames) table to TableA (Column LNames)
Below is my querie
CREATE TRIGGER [trig_addTable_A]ON Table_A FOR INSERT ASINSERT LName (LName)
SELECT LNameFROM TableMain inserted
I have inserted test names into the main table but nothing in table A has inserted. What have I done wrong.
Thanks
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Mar 11, 2007
I am looking for a INSERT trigger example, to achieve the following objective:
I would like the trigger to be fired when a row gets inserted into a table. I want to retrive some value from the inserted row and use this value to insert a new row in table 2.
Thanks
chri
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Mar 17, 2007
is it possible to run a trigger forever... whose work is to archive data from a table. or how can i do the operation to archive automatically ?Regards,Kamrul Hassan
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Aug 14, 2007
Hi,
Does anybody know how could I define a for each row trigger in sql Server 2005?
What I need to do is before inserting in the table look through the rows to check wheter that value overlaps with the others.
"Overlap" means that this value cannot be betweent the values fo two different columns, that is why I need to go through all the table.
In case that was not possible, I propose the following, load the table in a dataset and check the constraint with a for loop despite of the performance could be decreased.
Any suggestion?.
Thanks in advance.
Cheers.
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Aug 28, 2007
Hi everybody
I work on a Project that has Inbox .
I need that if a record has inserted in inbox system alert to user that view it's inbox .
The suitable solution for it seems trigger ,but i don't how trigger could communicate with Application.
Thanks for any guides.
Best Regard
A.Doroudian
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Nov 28, 2007
hi .... I am going to use trigger first time.
my secnerio is that I want a common column in five tables on the insertion of a row in a particular table..
question is simple ..... can I do that????????????????????
thanks in advance.
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May 28, 2008
Hello Experts,
Currently I have 3 tables; Persons, Student and Teacher. Persons is the parent table of Student and Teacher and they are linked by the Person_Id attribute. For example, if Person_Id 1 exist in Student table, it cannot be inserted anymore into Teacher table. How do I write a trigger in MS SQL to implement this business rule? Any experts can shed some light? Thanks!
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