how to create trigger

Department Table _ Delete:Use [Test]go/** * * * Object:trigger [dbo]. [Department _delete] Script DATE:2015/8/31 16:41:46 * * * * **/SET ansi_nulls ongoset quoted_identifier Ongo--=============================================--Author: --Create

Delete trigger drop TRIGGER * from INFORMATION_SCHEMA. ' TRIGGERS ';trigger syntax Trigger (TRIGGER): Monitors a situation and triggers an action. Trigger creation Syntax Four elements:1234. Trigger Event (insert/update/Delete) syntax: Create

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

MySQL triggers are an important part of the MySQL database. The following describes how to create and delete MySQL triggers in detail. MySQL triggers are an important part of the MySQL database. The following describes how to create and delete MySQL

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21. create and operate tables 21. 1. Create a table Create table: 1) Name of the new table, after the keyword CREATETABLE 2) names and definitions of table columns, separated by commas Create table MERs ( Cust_id int not null

It is said that the Pt-online-schema-change in the Pt-toolkit toolset can modify the table structure on-line without locking the table, so what is the specific principle of this tool, please see below to explain:Restrictions on the use of

Oracle uses a cursor to add a primary key statement to all user tables. oracle cursor Application Scenario: adding an auto-increment primary key to a data table can speed up data table access, and is the fastest in integer indexing. This program is

Row-level DML triggers Define for each row when an update operation is triggered for a record. Use the ": Old. Field" and ": New. Field" identifier No. Trigger statement : Old Field : New Field 1 Insert Undefined.

Re: http://bbs.51js.com/viewthread.php? Tid = 52487 & fpage = 2   [Original: database] SQL Server database development trigger applicationQuestion: SQL Server database development trigger application Author: cultivator Date: 2006-01-10 Note: Due to

MySQL trigger details Trigger-trigeer is a function used in a database to monitor data changes and trigger certain operations, simply put, a stored procedure is executed before or after a table meets certain conditions. Here we will briefly talk

Oracle uses a cursor to create a primary key statement for all user tables Application Scenario: adding an auto-increment primary key to a data table can speed up data table access, and is the fastest in integer indexing. This program is suitable

MySQL study note 15: trigger bitsCN.com A trigger is an event that triggers an operation. These events include INSERT statements, UPDATE statements, and DELETE statements. Create a trigger to create a trigger with only one execution

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Create MySql stored procedures and triggers (Lite version) bitsCN.com 1. CREATE a stored procedure delimiter // drop procedure if exists 'proc _ test' // create procedure 'proc _ test' (TABLE_NAME VARCHAR (20), num int) begin select * FROM

I. theory: 1. the trigger cannot use the dynamic SQL statement of call, you cannot directly return data to client 2. you cannot use statements to start or end a transaction in a trigger. 3. the trigger can only roll back the transaction in a table

TRIGGER Syntax creation trigger: CREATETRIGGERtrigger_nametrigger_timetrigger_eventONtbl_nameFOREACHROWtrigger_stmt; trigger_ti TRIGGER Syntax Create a trigger: Create trigger trigger_name trigger_time trigger_eventON tbl_name for each row

MySQL 21-29 highlights: Views, triggers, stored procedures, cursors, transaction processing bitsCN.com 21. create and operate tables 21. 1. create a table Create table: 1) Name of the new table, after the keyword CREATETABLE 2) names and definitions

Tutorials on basic functions and triggers in the MySQL stored procedure, mysql Stored Procedure Common functions of MySQL stored procedures I. string typeCHARSET (str) // returns the string Character SetCONCAT (string2 [,...]) // connection

1. TRIGGER introduction trigger is a mysql TRIGGER. When a trigger is created, it monitors specific events. When a TRIGGER is triggered, an object is activated to process trigger_stmt, that is, the statement to be executed. For example, when you add