This tutorial shows you step by step how to use the Oracle MERGE statement to update or insert data based on a specified condition.

Use the MERGE statement to select rows from one or more sources for update or insertion into a table or view. You can specify conditions to determine whether to update or insert into the …

The MERGE statement was introduced in Oracle 9i to conditionally insert or update data depending on its presence, a process also known as an "upsert". The MERGE statement …

The PL/SQL MERGE statement in Oracle database is a powerful and flexible way to perform conditional insert, update, or delete operations in a single SQL statement.

Jan 31, 2025 · This article explores four key reasons why you should use the Oracle MERGE statement, explains its syntax and key clauses, and provides practical examples to help you …

Jan 20, 2025 · In this guide, you learned what the SQL MERGE statement is and how to use it in PostgreSQL, SQL Server, and Oracle. You now know that it enables you to perform …

MERGE is a key-preserved operation — that is, for each source row, Oracle has to be able to identify a single target record for update. The simplest method of ensuring this is to join source …

Dec 16, 2020 · Oracle does not support AS to define aliases for derived tables. The problem is the "as" clause you've specified. Looks like you want to name your columns in the union'd …

May 9, 2024 · The MERGE statement compares data between a source table and a target table based on specified key fields. It performs appropriate actions like inserting new records, …

Dec 6, 2025 · The SQL MERGE statement allows you to perform multiple INSERT, UPDATE, and DELETE operations in a single statement. This makes it a powerful tool for handling situations …