pl_sql中用case when 语法

用case when 条件 then xxx
when..............then
when..............then
end

eg:
select t.taxpayerid,
       case
         when t.taxpayerver = '1' then
          'dddd'
         when t.taxpayerver = '3' then
          'kkkk'                   
       end,
       t.*
  from tb_reg_taxpayerbasicinfo t