Yes, this is correct. SQL specification defines this behaviour.

On 2016.12.07. 14:24, Slavomir Skopalik wrote:
> Hi,
>
> is it correct that empty string '' in comparison with one space string '
> ' is evaluated as true?
>
> SELECT * FROM rdb$database WHERE ''=' '
>
> FB 2.5.6, database dialect 1
>
> Slavek
>
>


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