Carlo Romagnano (7/9/2013)

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Hugo Kornelis (7/9/2013)

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Carlo Romagnano (7/9/2013)

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select concat(null + 'Hello','testString') as a

, null+'testString' as b

It simply returns 'testString', NULL

😀

Yup. If you wanted to get 'HellotestString', you'd use SELECT CONCAT(NULL, 'Hello', 'testString');

No, I didn't want!

It's a joke!