oracl 修改已有数据的字段类型

alter table  tb_org_structurepicture_temp  rename column c_oid to c_oid1;

ALTER TABLE tb_org_structurepicture_temp ADD c_oid  number(19); 

UPDATE tb_org_structurepicture_temp t SET t.c_oid = to_number(t.c_oid1); 

ALTER TABLE tb_org_structurepicture_temp  DROP COLUMN c_oid1;