MS ACCESS SQL Join Subquery -

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i have 2 tables: newparts, storedparts

i insert parts of newparts, not jet in storedparts storedparts:

sql_string = "insert storedparts " & _              "select newparts.* " & _              "from storedparts " & _              "right join newparts on (storedparts.identifier = newparts.identifier) , (storedparts.timestamp = newparts.timestamp) " & _              "where ((storedparts.autoid) null);"

this working fine far. problem: table storedparts getting big programm taking long join process. solution: compare newparts not parts of storedparts, parts aren't older 4 days... tried subquery this, can't run.

sql_string = "insert storedparts " & _              "select newparts.* " & _              "from storedparts (where storedparts.timestamp > now() - 4) " & _              "right join newparts on (storedparts.identifier = newparts.identifier) , (storedparts.timestamp = newparts.timestamp) " & _              "where ((storedparts.autoid) null);"

any appreciated.

this wouldn't problem if tables have indexes.

create index ndx_sp_identifier on storedparts (identifier); create index ndx_np_identifier on newparts (identifier);

then suggest change query @jarlh pointed out.

insert storedparts  select newparts.*  newparts left join storedparts  on newparts.identifier = storedparts.identifier , newparts.timestamp = storedparts.timestamp storedparts.autoid null;

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