PostgreSQL ON CONFLICT Statement

PostgreSQL ON CONFLICT Statement - Explained

Introduction to ON CONFLICT Statement

The ON CONFLICT statement in PostgreSQL allows you to handle conflicts that arise from inserting or updating data in a table with a unique constraint or index. It provides a way to control how conflicting rows should be handled, such as updating existing rows or ignoring conflicting rows.

Syntax

                
                    INSERT INTO table_name (column1, column2, ...)
                    VALUES (value1, value2, ...)
                    ON CONFLICT (conflict_target)
                    DO UPDATE SET column1 = value1, column2 = value2, ...
                
            

Explanation of each part of the syntax...

Example

                
                    INSERT INTO employees (employee_id, name, salary)
                    VALUES (101, 'John Doe', 50000)
                    ON CONFLICT (employee_id)
                    DO UPDATE SET name = EXCLUDED.name, salary = EXCLUDED.salary;
                
            

Explanation of the example...

Benefits of ON CONFLICT Statement

• Enables handling of conflicts in a flexible and controlled manner
• Reduces the need for manual error handling and conflict resolution
• Improves data integrity and consistency in the database

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