sql - How to update the first digit of a number only? -

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I need to update the first digits of numbers, for example, 3003

I just want to change the first '3' to '2' and do not want to change the last digit '3'.

Like some of the following faulty queries: 

  update table set defaulttopicorder = replacement (default detectiontracker, left (defaulttop order, 1), 2) where ....   
 
 
  Default tabcorder  is a non-decimal, assuming the column, this number 
 
  SET defaulttopicorder = defaulttopicorder + POWER (10, LAN (STR (default desktop))  
 
 ... so If you want to subtract 1 from first Issue: 
 
  SET defaulttopicorder = defaulttopicorder + -1 * power (10, LAN (STR (default desktop))

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