Hello, Andrei!
You wrote  on Thu, 14 Dec 2006 00:19:18 -0000:

create table t (
  i integer,
  c computed by ((select count(*) from t new_t where t.i = new_t.i))
)
и все пучком

Удач
--
Alexander A. Venikov, Tobolsk, Russia
Real e-mail address is venix<angry_dog>tn<dot>tob<dot>ru

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