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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Testing for NULL and equality in practice

Posted by jpluimers on 2019/05/30

Great article: Testing for NULL and equality in practice [WayBack]

Most important table piece I learned:

 Testing (in)equality of A and B in different Firebird versions

Test type Firebird version
<= 1.5.x >= 2.0
Equality 
A = B or A is null and B is null
 
A is not distinct from B
Inequality 
A <> B
or A is null and B is not null
or A is not null and B is null
 
A is distinct from B

–jeroen

This entry was posted on 2019/05/30 at 12:00 and is filed under Database Development, Development, Firebird, SQL. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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