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create or replace trigger b_trigger after update of a_id on b referencing new as n old as o for each row when (n.a_id is null) begin atomic declare null_row_id int; -- set null_row_id = (select a_id from a where a_code = 'custom null string'); -- if null_row_id is null then signal sqlstate '70000' set message_text = 'custom null string row not ...
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