SQL Q & A Part 3 - NULL Functions NVL, NVL2, NULLIF, DECODE, & COALESCE

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NULL is a keyword used to represent ‘unknown’ or ‘missing’ data. NULL is not ‘zero’ or ‘blank’. SQL NULL functions are used to validate it. Explained NVL(), NVL2(), NULLIF(), DECODE() & COALESCE() in detail with examples

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