Domande di colloquio di Emerson Ecologics: What is the difference between UNION and UNION ALL | Glassdoor

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Emerson Ecologics

Colloquio per Software Developer presso Emerson Ecologics

Domanda di colloquio di Emerson Ecologics

Colloquio per Software Developer

What is the difference between UNION and UNION ALL

Risposte di colloquio

Anonimo

23 set 2019

Union avoid duplicate records AND union all does not check for duplicate records

Anonimo

17 nov 2016

I don't often use unions as I feel they're indicative of bad database design, so I'll be honest and simply say I don't know.

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