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SQL Server trigger instance details, SQL trigger
Microsoft SQL Server™2000 provides two main mechanisms to force business rules and data integrity: Constraints and triggers. A
operation and trigger before the event occurs, in this way, it does not execute the original SQL statement, but operates according to the definition in the trigger.Trigger condition:
DML triggers are activated in response to UPDATE, INSERT, and DELETE statements. DDL triggers are activated in response to CREATE, ALTER
needs to be displayed in the result setStatisticsInformation, The optimizer will select the best execution method, because the optimizer willStatisticsInformation.
InCreateWhen indexing, SQLServer will be on the index ColumnCreateStatisticsInformation. To put it simply,StatisticsInformationThat is, the data that can describe the data distribution in the index or column.
Query selectivity:
Formula: Total number of non-duplicated data in a column/total number of data in a column
The higher the s
SQL server trigger, stored procedure operation remote database insertion data, solve the existing problems on the server, server trigger
I recently created a small project, which is not very complicated. I need to back up some dat
Label:Type: Reprint
The SQL UPDATE trigger can get information about the row being update, and the friend you need can refer to it.
Copy CodeThe code is as follows:Create Trigger TgnameOn TBFor updateAsIf Update (recommend)Be
Speaking of synchronization, in fact, "homework" schedule stored procedures to operate the data, add, delete, change, all in the inside, combined with triggers, cursors to achieve, about job scheduling, using 5 seconds to run a "second-level operation", so basic even faster "synchronization"Do is SQL Server to the Oracle side synchronization, first set up on the SQL
Misunderstanding #4: DDL triggers (introduced after SQL Server 2005) are INSTEAD triggers
This is wrong
The implementation principle of DDL triggers is actually an AFTER trigger. This means that a DDL operation is performed first, and then the trigger captures the operation (of course, if you write Rollback in the
Views are often used recently, but MSSQL Server does not allow update operations on views associated with more than two base tables. Due to the project's needs, I spent a night studying it. Take some time to record the process and experience.
Let's take a look at the authoritative saying:
Updatable View:
Microsoft SQL Server
SQL Server uses Trigger to monitor the stored procedure change script instance, trigger Stored Procedure
The following triggers are used to monitor changes to stored procedures.Create a monitoring table:
Create table AuditStoredProcedures (DatabaseName sysname, ObjectName
server| View
View is often used recently, but MSSQL server does not allow the update of view that is more than two base tables associated with it. As a result of the project needs, spent a night to study it. Take some time to record the process and the experience.
Let's look at the authoritative statement:
Updatable views:
Microsoft
be modified. ', 10, 1)ROLLBACK TRANSACTIONEND
Working process of the instead trigger
You can specify the instead of trigger on a table or view. Executing this trigger can replace the original trigger action. The instead of trigger extends the type OF view
SQL trigger instance 1Definition: What is a trigger? In SQL Server, certain operations on a table trigger certain conditions to execute a program. A trigger is a special stored procedur
| View}[WITH Encryption]{{for | After | Instead of} {[insert] [,] [UPDATE]}[With Append][Not FOR replication]As[{If Update (column)[{and | or} update (column)][... n]| if (columns_updated () {bitwise_operator} updated_bitmask){comparison_operator} Column_bitmask [... n]} ]Sql_statement [... n]}}
ParametersTrigger_name
is the name of the
Tags: and insert ROM info level creat update Set SelectCREATE TRIGGER [dbo]. [Updataalarmlevel]on [dbo]. [Alarm_alarm_info]After inserts, update– after updating and insertingAsBEGINIf update (transfernum) or update (Potentialloss) – event triggered if the Transfernum or Pote
Grammar:Trigger on the INSERT, UPDATE, or DELETE statement to a table or view (DML Trigger)CREATE TRIGGER [schema_name.] Trigger_nameOn {table | view}[With {for | After | INSTEAD of}{[INSERT] [,] [UPDATE] [,] [DELETE]}[With APPEND][Not for REPLICATION]as {sql_statement [;] [
today we want to know the trigger application. What content should be written in the trigger to simplify the above code? Create a trigger.The syntax for creating a trigger is long and simplified:QUOTE:CREATE TRIGGERTrigger nameONTable name/View Name{ FOR | AFTER | INSTEAD}{[DELETE] [,] [INSERT] [,] [
A trigger is a special type of stored procedure that differs from the stored procedure we described earlier. Triggers are triggered primarily by an event that is automatically invoked to execute. The stored procedure can be called by the name of the stored procedure.Ø what is a triggerA special stored procedure that is automatically executed when a trigger inserts, updates, or deletes a table. Triggers are
, but today we want to know the trigger application. What content should be written in the trigger to simplify the above Code? Create a trigger.
The syntax for creating a trigger is long and simplified:Reference: Create
To write a trigger:
The code is as follows
Copy Code
Create Trigger BlogdeletOn BlogInstead of deleteAsDelete from Commentwhere Commentblog in (select Id from deleted)
Create an UPDATE trigger
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