How do you handle NULL values in SQL? Explain IS NULL, COALESCE, and NULLIF.

How do you handle NULL values in SQL? Explain IS NULL, COALESCE, and NULLIF.

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: medium

标签: interviewbit, data-analyst, topic-specific, data-analysis, analytics

参考答案摘要

NULL represents missing or unknown data. It does not behave like a regular value. One important rule is that NULL = NULL does not return TRUE. It returns NULL. That’s why comparisons using = don’t wor...

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