gastrocus wrote:
> INSERT INTO T1 (type, name, sysid, flag) values (1, 'ZZZZZ', 1, 0)
> WHERE NOT EXISTS (SELECT 1 FROM T1 WHERE name = 'ZZZZZ')

You can apply select to rdb$database table which always returns one row:

INSERT INTO T1 (type, name, sysid, flag)
SELECT 1, 'ZZZZZ', 1, 0 FROM RDB$DATABASE
WHERE NOT EXISTS (SELECT 1 FROM T1 WHERE name = 'ZZZZZ');

HTH

-- 
Milan Babuskov

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