How Can I Use 'INSERT IF NOT EXISTS' to Prevent SQL Duplicate Entries?

Avoiding Duplicate Entries with "INSERT IF NOT EXISTS"

When entering data into a SQL table, ensuring uniqueness is crucial to maintain data integrity. This issue arises when attempting to prevent duplicate entries based on specific parameters. The following code demonstrates a method for inserting values into a table only if they do not already exist:

IF NOT EXISTS (
  SELECT 1

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