ORACLE A表字段更改为B表的字段

UPDATE IM_PARA_CHECK_DATA_NEW A SET (OPERASTATE, COVER_TYPE, COVER_PRO, WORK_BAND, DEVICE_TYPE) =
(
SELECT OPERASTATE, COVER_TYPE, COVER_PRO, WORK_BAND, DEVICE_TYPE FROM LTE_ECELL_CONDATA_TOWYPT B WHERE A.CGI = B.TCI(+)
);

如果数据量太大，则创建索引

1、创建索引

create index 索引名 on 表名(列名);

2、删除索引

drop index 索引名;

3、创建组合索引

create index 索引名 on 表名(列名1,,列名2);