Make ISQL do not count records that in fact are not deleted from mon$attachments due to mon$system_flag=1 (Cache Writer & Garbage Collector) [CORE4958] · Issue #5249 · FirebirdSQL/firebird · GitHub
Firebird can't count records from a subquery with unnamed column [CORE6483] · Issue #6714 · FirebirdSQL/firebird · GitHub
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