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摘要： ORACLE:BEGIN EXECUTE IMMEDIATE 'DROP TABLE CUX_PO_VENDORS';EXCEPTION WHEN OTHERS THEN NULL;END;alter table Tablename drop column column1alter table Tablename add(column1 varchar2(20),column2 number(7,2)...)SQL SERVER:IF COL_LENGTH('SYSFORM012','BUSINESS_SCOPE') IS NULL BEGIN 阅读全文