sql - missing rows, how to select values -

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how accomplish this: have bunch of numbers (for example: 2342423; 34443123; 3523423) , of them in database table primary key value. want select numbers, not in table. best way this?

if few numbers can do

select tmp.num (   select 2342423 num   union   select 34443123   union   select 3523423 ) tmp left join your_table t on t.id = tmp.num t.id null

if more few numbers should insert these table , left join against table this

select twntc.num table_with_numbers_to_check twntc     left join your_table t on t.id = twntc.num t.id null

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