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declare v_cnt number; begin select count(*) into v_cnt from dba_tab_columns where table_name=‘T_IDC_FUNCTION‘ and column_name=‘TEST1‘; if v_cnt = 0 then execute immediate ‘alter table t_idc_function add test1 varchar(40)‘; null;--IF语句里面必须至少一行SQL语句,所以当没有任何语句的时候,可以添加这一句 end if; end;
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原文地址:http://www.cnblogs.com/subendong/p/4288135.html