howItsDone123

  if (select object_id('aTableName', 'u')) is not null begin
    select column
      from aTableName
     where thisIsTrue = 1
           and somethingIs in (select aList from aListTable)
           and somethingElse = (
             select aValue
               from aValueTable
              where aValue = 'somethingImportant'
           )
  end else begin
    print('Oh noes! I couldn't find somethingImportant or something in someList form aTable!')
  end