how to create trigger

Basic MySQL triggers (6) and mysql triggers 1. Why trigger: In a MySQL database, a database object table is a logical structure for storing and operating data, and a database object trigger is used to perform an operation triggered by some table

The use of REPLACE into is similar to insert, and ultimately the purpose in the table is to insert a new row of data. The difference is that when a primary key or a unique index conflict occurs when inserting, the original record is deleted and the

Creating triggersCreate a trigger with only one execution statement Copy Code code as follows: CREATE TRIGGER Trigger Name before| After Trigger event On table name for each ROW EXECUTE statement Where the trigger name

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

SQL Server triggersA 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

Use NewTest1---Declaration view---CREATE VIEW newviewteasselect studentinfo.name as name, studentinfo.sex as gender, course.name as course from St Udentinfo join Course on studentinfo.cid= course.id---Call view select * FROM newviewte---declaration

Transferred from: http://www.cnblogs.com/hoojo/archive/2011/07/20/2111316.htmlA 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

The previous article is a relatively simple view, in fact, it is relatively simple to use, and later what more about the use of views, the time to add in their own. Next, let's look at the use of triggers!I. Overview OF triggers 　 1.1. What is a

Trigger (Trigger): Monitors a situation and triggers an action, the trigger must have a name, a maximum of 64 characters, and may be appended with a delimiter.It's basically like naming other objects in MySQL.Trigger creation Syntax four elements: 1.

Compared to the mysql5.1 Handbook, this paper summarizes the SQL programming of the past few days, mainly related to triggers, stored procedures, rights Management, master-slave separation and so on, the right when the expert, please skip.The

Reprint Please specify source: http://blog.csdn.net/l1028386804/article/details/46763665A trigger is a special stored procedure, in which the stored procedure is called with call, and the trigger does not need to use the callingIt does not need to

A trigger is a special kind of stored procedure that triggers a run when inserting, deleting, or altering data in a particular table, which has finer and more complex data control than the standard functionality of the database itself.Database

--DAY16 Course Content--CREATE DATABASE DAY16;Use DAY16;--*************, data constraint ********************------1.1 Default valueCREATE TABLE Student (ID INT,NAME VARCHAR (20),Address VARCHAR Default ' Guangzhou Tianhe '--defaults)DROP TABLE

Scene One, data table automatic backup (Multiple tables field synchronization, etc.), using triggers. If Updatelog records all operations logs for a resource, Reslastlog logs information about the last operation of the resource. The synchronization

SELECT * FROM Fruitselect * from Loginselect * from Orderdetailsselect * to Ordersselect * FROM info SELECT * FROM Familygo-Stored procedures, to achieve the user purchase of fruit operations, to determine the relationship between the purchase

A trigger is a special kind of stored procedure that triggers execution when inserting, deleting, or modifying data in a particular table, which has finer and more complex data control than the standard functionality of the database itself.Database

A trigger is a special kind of stored procedure that triggers a run when inserting, deleting, or altering data in a particular table, which has finer and more complex data control than the standard functionality of the database itself.Database

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

Trigger | tips | design trigger design techniques and examples in database design, there are two methods to set up automatic data processing rules, one is conditional constraint, is a trigger, generally speaking, conditional constraints are

1. Migrating datafor database porting, SQL server=>mysql. The following trigger are available on SQL Server SET QUOTED_IDENTIFIER on go SET ansi_nulls on go ALTER TRIGGER [trg_risks] on Dbo.projectrisk for INSERT, update as BEGIN