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ALTER TABLE  m_stock_info  modify  stock_model   varchar(100) default  NULL ;



alter table v3x_common_guidmapper  add update_time timestamp    DEFAULT CURRENT_TIMESTAMP;





mysql:update v3x_common_guidmapper  set  update_time=sysdate()
oracle:update v3x_common_guidmapper  set  update_time=sysdate
sqlserver:update v3x_common_guidmapper  set  update_time=getdate();