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Copy codeThe Code is as follows: Create trigger tri_wk_CSVHead_History on wk_CSVHead_History
-- Declare a tri_wk_CSVHead_History trigger,
Instead of insert --- the insert operation is replaced by the following Operation
As
Begin
Declare YB cursor -- declare a cursor
For
Select NoteNO from inserted -- The NoteNO here must match the following
Open YB
Decla
Tags: number server time serve ber ALS sel nbsp another Use [CDM] GO/** * * * Object:trigger [dbo]. [Updateakisflight] Script DATE:2018/6/14 16:43:29 * * * * **/SET ANSI_NULLS on Go SET quoted_identifier on Go ALTER TRIGGER [dbo].
[Updateakisflight] on [dbo].
[Flightwarntime] For Insert,delete as BEGINif(Exists (Select 1 frominserted) and NOT EXISTS (Select 1 fromdeleted)) Begin declare @TwoCode
SQL Server triggers enable simultaneous addition, deletion, and update of multiple tables
Definition: What is a trigger? In SQL Server is a certain operation of a table, triggering certain conditions, thus executing a program. A
I tried multiple times and finally concluded that when multiple SQL Server tables are associated with update, an as Alias cannot be added to an external table, and a syntax error is returned.Only the table name can be written as the prefix for reference and cannot be referenced using an alias.The syntax can be referred to belowUpdate a set Field 1 = B table field
Copy Code code as follows:
--Create a log table
CREATE TABLE triggerlog (loginfo XML)
--Create a dummy table to delete later on
CREATE TABLE tabletodelete (Id int PRIMARY KEY)
--Create a new table as a delete test table
INSERT into Tabletodelete VALUES (1)
G
The following trigger are used to monitor changes to stored procedures.To create a monitoring table:
CREATE TABLE auditstoredprocedures (
DatabaseName sysname
, objectname sysname
, LoginName sysname
, ChangeDate datetime
, eventtype sysname
, eventdataxml xml
);
To create a monitoring
SQL Server uses triggers to update multi-table views.
The procedure is to use the update trigger to generate two virtual tables "inserted" to store the modified data information and the "deleted" table, then, update the correspond
();
Sqlcommand cmd = new sqlcommand ();
Cmd. Connection = con;
Cmd. commandtext = "Update order main file set delivery city = @ city where order number = @ ID ";
Sqlparameter p1 = new sqlparameter ("@ City", city );
Sqlparameter P2 = new sqlparameter ("@ ID", ID );
Cmd. Parameters. Add (P1 );
Cmd. Parameters. Add (P2 );
Int ROW = cmd. executenonquery ();
Con. Close ();
Sqlcontext. Pipe. Send (row. tostring ());
}
};
Take a cl
trigger is activated. The After trigger can only be used for tables.
Each modification action (insert, update, and delete) of a table or view can have an instead of trigger. Each modification action of a table can have multiple After triggers.
4. Trigger Execution Process
I
1. A trigger is a special stored procedure. It cannot be explicitly called. Instead, it is automatically activated when a record is inserted, updated, or deleted into the table.Therefore, triggers can be used to implement complex integrity constraints on tables.
2. SQL Server creates two special tables for each trigger
Label:1. Understand the database and create new: 1) Open the database and connect to the server. 2) service type without tube. 3) server name: Make a point "." Indicates that the server is on the local computer and, if it is hosted on someone else's server, enter the
extension information table", column 'instructor number '.
The statement has been terminated.
Then I studied the foreign key constraints of SQL Server. What is going on? I found a definition on the Internet:
Title
Foreign key constraint
If a non-null value is input in the foreign key constraint column, this value must exist in the referenced column; otherwise, an error violation error message is
Label:1. Understand the database and create new: 1) Open the database and connect to the server. 2) service type without tube. 3) server name: Make a point "." Indicates that the server is on the local computer and, if it is hosted on someone else's server, enter the
1. A trigger is a special stored procedure. It cannot be explicitly called. Instead, it is automatically activated when a record is inserted, updated, or deleted into the table.Therefore, triggers can be used to implement complex integrity constraints on tables.
2. SQL Server creates two special tables for each trigger
statement violates the constraints, the after trigger will not be executed because the check on the constraints occurs before the after trigger is excited. Therefore, the after trigger cannot exceed the constraints.The instead of trigger can be executed instead of the action that inspires it. It has just been created
Label:Operations on the database in SQL Server: To delete a table:DROP table NameTo modify a table:ALTER TABLE table name add column Add column list typeALTER TABLE table name drop column name Deleting a databaseDrop database name CRUD OperationsC--create Add data r--read read Data u--update modify data d--delete Delet
join [DBO]. ZHONGHE_TAB as z on f. Student ID = Z. Student ID8 order by f. Student ID ASC9 GO10. View the created view:3.2.1. Modify the information of multiple data tables through the view ???? :1 UPDATE [SQL-LI]. [dbo]. [SHITU_FFENSHU_XINXI]2 SET [name] = 'aaaaa', -- this field is in the [information table]3 [average score] = 111 -- this field is in [score]4 WHERE [student ID] = 60805 GO results:
One: A trigger is a special stored procedure that cannot be invoked explicitly, but is automatically activated when you insert records into a table ﹑ update records or delete records. So triggers can be used to implement complex integrity constraints on a table.
Two: SQL Server creates two private tables for each
how the deadlock occurred.There are two ways to understand the immediate cause of deadlocks in SQL Server: (1) Collect SQL Trace. (2) Turn on the 1222 switch. Because problems can be reliably reproduced in a test environment, we can gather as much information as possible and use both methods.First we use the following script to open the 1222 switch.DBCC TRACEON
SQL Server 2008 provides an enhanced SQL command merge for use in the msdn:http://msdn.microsoft.com/zh-cn/library/bb510625.aspx
Function: Inserts, updates, or deletes on the target table based on the results of joining with the source table. For example, you can synchronize two tables by inserting, updating, or deleting rows in a table based on differences foun
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