Help me to write a sql,please :)

[eboys_lsq]

     I want to write a sql to order by a column, whe column contain only three type 
"a", "b", "c", 
how can I order by the column with the sequence of  b,a,c .  thank you.
  My english is not well ,sorry.,. :)


   Best Regards
      LSQ

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