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Three triggering methods of sql trigger
Three triggering methods: before: Triggered before data modification, used to enforce business rules. after insert: Triggered after inserting a new row, used to add or update data to other tables. after update: Triggered after updating an existing row, used to update related tables or record change history. If you want to know more about SQL triggers, you can read the articles below this topic.
Call SQL trigger to execute external programTitle: Specific code examples for SQL triggers to call external programs Text: When using SQL triggers, sometimes it is necessary to call external programs to process some specific operations. This article will introduce how to call external programs in SQL triggers and give specific code examples. 1. Create a trigger First, we need to create a trigger to listen for an event in the database. Here we take the "order table (order_table)" as an example. When a new order is inserted, the trigger will be activated, and then an external program will be called to perform an operation.
SQL trigger functions and syntaxIntroduction to the use and syntax of SQL triggers: A SQL trigger (Trigger) is a special stored procedure that is automatically triggered to execute when a specific operation occurs on a database table. Triggers enable automated processing of table data update, insertion, and deletion operations. This article will introduce the use and syntax of SQL triggers, and provide specific code examples. 1. The concept and function of SQL triggers SQL triggers are a very important part of the database. They can perform specific data operations (such as INSERT,
Introduction to SQL triggers and their advantages and disadvantagesIn this tutorial, we will briefly cover the advantages and disadvantages of SQL triggers. A SQL trigger is a set of SQL statements stored in a database catalog. A SQL trigger is executed or fired whenever an event associated with a table occurs, such as an insert, update, or delete.
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