Web Reference: A single insert statement is always a single transaction. It's not as if the SQL Server evaluates the subquery first and then at some later point, and without holding a lock, goes on to do the insert. Jul 23, 2025 · There are many methods to check the data if it exists like IF EXISTS, IF NOT EXISTS, or using the WHERE clause. In this article, we will discuss the 'IF NOT EXISTS' alternative to check and insert a row of data into a table or to bulk insert data into a table. May 17, 2025 · In this tutorial, we’ll discuss various approaches for performing an insert if not exists operation in MySQL, PostgreSQL, and SQL Server. To demonstrate, let’s use the Baeldung University database schema.
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