COALESCE () SQL
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The COALESCE function in SQL is used to handle NULL values effectively. It returns the first non-null expression from a list of values. This is especially helpful when working with incomplete data in databases. For example, COALESCE(column1, column2, 'Default') will return the value of column1 if it’s not null; otherwise, it checks column2, and if both are null, it returns “Default”. This makes queries more reliable and prevents unexpected null results. COALESCE is widely used in reporting, data cleaning, and conditional SQL statements.
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