The `DATE_SUB()` function is a powerful tool in SQL for manipulating dates. It takes two arguments: the date value and the interval to subtract. The interval can be expressed in terms of days, months, or years. This function is essential for tasks like calculating past dates, determining age, or generating date ranges for reporting. Understanding how to use `DATE_SUB()` correctly is vital for working with temporal data in databases.For example, if you want to find the date one week ago from today, you can use `DATE_SUB()`. It's important to note that the exact behavior of `DATE_SUB()` can vary slightly depending on the specific SQL dialect (e.g., MySQL, PostgreSQL, SQL Server). Always consult the documentation for your database system for precise details.One common use case is calculating the date of birth of a customer based on their age. You can subtract the age in years from the current date to get their date of birth. Another use case is creating historical data for analysis. You can use `DATE_SUB()` to generate a range of dates for the past year or month to analyze trends.The function is flexible and can be used in various contexts. For instance, you can subtract a specific number of months or years from a date to determine the date of a previous event or to create a date range for reporting. This function is crucial for tasks involving date arithmetic and manipulation.