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Update Trigger
Posted by: sriPathi n
Date: March 13, 2008 01:39AM

i have done a table in mysql, that table column value should be 2 whenever i tries to insert that value as null. i have tried with the following trigger but it is not allowed me to insert. what is the problem, please give a solution?

create trigger val_null after insert on tbl1 for each row
begin
update tbl1 set col_val=”2” where col_val=null or col_val=’’ or col_val=’ ‘;

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