SQL Case statement

madeinstein , 
CASE Column1

  WHEN 1 THEN Column2*1

  WHEN 2 THEN Column2*2

  ELSE Column2

END as MyColumn,

-- or

CASE 

  WHEN max(Column1) = 1 THEN Column2*1

  WHEN max(Column1) = 2 THEN Column2*2

  ELSE Column2

END as MyColumn,

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