1. create table <tablename> as select * from <原有表> where 1 = 0
2. create table b as select colum1+colum2 col1 , colunm2 ,column3 , column4 from a where 1 = 0
2. create table b as select colum1+colum2 col1 , colunm2 ,column3 , column4 from a where 1 = 0
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