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2025-04-06 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Select 10 + 10 + 10 from dual
The result is 30, no problem at all.
Select null + 10 + 10 from dual
The result is an empty string, but the expected result is 20.
Select nvl (null,0) + 10 + 10 from dual
The result of this treatment is 20. If the query has a null value, it needs to be processed by nvl, otherwise the operation will be incorrect.
Select null | | 10 | | 10 from dual
There is no problem with string concatenation.
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