Why NULLs break your COUNT and AVG | SQL interview
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YouTubeThe Data Round
Why NULLs break your COUNT and AVG | SQL interview
NULL isn't zero and isn't empty. It's 'unknown,' and it breaks math quietly. Aggregates skip NULLs: AVG and COUNT(column) ignore them, so your average is over fewer rows than you think. And NULL compared to anything is NULL, never true. NULL means unknown, so SQL refuses to guess. COUNT(*) counts rows, COUNT(col) skips NULLs. AVG divides by the ...
703 views3 weeks ago
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