Web Reference: If you are working in a SQL Server-specific environment and only need to handle NULL values for one expression, ISNULL may be more concise. If you need to handle NULL values for multiple expressions or want to follow ANSI SQL standards for better portability, COALESCE is a more suitable choice. The COALESCE() function is the preferred standard for handling potential NULL values. The COALESCE() function returns the first non-NULL value in a list of values. Oct 3, 2022 · When writing T-SQL, a lot of developers use either COALESCE or ISNULL in order to provide a default value in cases where the input is NULL. They have various reasons for their choice, though sometimes this choice may be based on false assumptions.
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