count - Strange result in DB2. Divergences queries -

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a strange thing, don't know cause, happenning when trying collect results db2 database.

the query following:

select     count(*)     myschema.table1 t1     not exists (         select             *                     myschema.table2 t2                     t2.primary_key_part_1 = t1.primary_key_part_2             , t2.primary_key_part_2 = t1.primary_key_part_2     )

it simple one. strange thing is, same query, if change count(*) * 8 results , using count(*) 2. process repeated more times , strange result still continuing.

at example, table2 parent table of table1 primary key of table1 primary_key_part_1 , primary_key_part_2, , primary key of table2 primary_key_part_1, primary_key_part_2 , primary_key_part_3. there's no foreign key between them (because legacy ones) , have huge amount of data.

the db2 query select versionnumber sysibm.sysversions returns:

7020400 8020400 9010600

and client used squirrelsql 3.6 (without rows limit marked).

so, explanation strange result?


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