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How to Perform Data Cleaning and Preprocessing?
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Several steps may be involved in SQL data cleaning and preprocessing:
Use the ROW_NUMBER() window function or the DISTINCT keyword to eliminate duplicates.
Managing missing values: To replace NULL values, use functions such as COALESCE.
Use the CAST or CONVERT functions to fix data types.
Utilize string functions like as LOWER, UPPER, TRIM, and others to standardize formats.
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