What is Coalesce Function in Structured Query Language (SQL)
What is Coalesce Function in SQL?
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Chapters:
00:00 - Introduction to COALESCE Function in SQL
00:10 - What is the COALESCE Function in SQL?
00:15 - COALESCE Function vs. NULLIF Function in SQL
00:27 - Practical Use of COALESCE in SQL
00:33 - Syntax and Practical Implementation
00:47 - Practical Example with COALESCE in SQL
00:53 - Comparison with NULL Function in SQL
01:16 - Output Comparison
01:22 - Key Differences and Interview Tips
01:46 - Conclusion
01:56 - Closing Remarks
We will discuss the COALESCE function, which returns the first non-null expression in a list. If all expressions are null, it returns null. The COALESCE function is similar to ISNULL and is used to replace null values with a default value. Both functions have the same syntax and produce the same output. Understanding both functions is important for interview questions, as they might ask about the difference between ISNULL and COALESCE, even though there is none.
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