One Practical SQL Trigger Example You Can Actually Use
The article explains how to create a SQL trigger for automatic auditing of salary changes in an Employees table. It provides step-by-step instructions for setting up the main table, inserting sample data, creating an audit table, and defining the trigger. The example highlights differences in syntax across various SQL databases, including SQL Server, MySQL, PostgreSQL, and Oracle.
- ▪A trigger allows the database to automatically perform actions in response to data changes.
- ▪The article provides a practical example of using a trigger to create an audit trail for salary changes.
- ▪Different SQL databases have varying syntax for creating tables and triggers.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3751190) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Baldwin Apps Posted on May 29 • Originally published at Medium One Practical SQL Trigger Example You Can Actually Use #sql #database #programming #dataengineering One UPDATE statement. One trigger. One automatic audit record — no extra code required. Triggers are one of those SQL features that can seem a little mysterious at first, but the basic idea is simple: a trigger lets the database automatically do something when data changes.
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