How to set the parameter of the cell so that information is recorded there when you import data if its length is equal to exactly five characters and starts at a certain number, for example 2?

Answer 1

create trigger check_available
BEFORE INSERT ON TABLE
For Each Row
Begin.
  SELECT if.stringcolunm & lt; & gt; 5 and substring (new.stringcolunm, 1, 1) & lt; & gt; 2) Then.
   Set new.stringcolunm = ''
  END IF;
End.