Optimizing Subqueries in Update Statements: A PL/SQL Deep Dive

Update Duplicate Data in Databases Using Self-Join and MERGE Statement

How to Update Various SQL Columns Based on Another Column of the Same Row Using Bulk Operations

Understanding and Avoiding Duplicate Insert Queries in MySQL: How to Resolve the SQLSTATE[42000] Error

Understanding Oracle's UPDATE Table Quirk: How to Update Non-Key-Preserved Tables