sql - Truncation Warning when data should fit -

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We are updating column A with exact value from column B. Column B has a length of 255 and column A4 is the data in column B is verified by LN (reverse (coal)) only 4. When we try to update the error message, it says: / P> 

  Update table set column A = columnB where in column B ('ABC', 'ABCD', 'AB')   
 We have also verified This works:  
  Update table set column A = left (column B, 4) where in column B ('ABC', 'ABCD', 'AB')   
 What could be wrong Any guess in the form?  
  ) Data type for column B, in which case your database may consider the width of the engine column, despite the width of the data. The  trim  function can then get rid of the error.

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