摘要:
dmp文件的导入:1.首先,先创建表空间与用户--创建表空间create tablespace CCFOCUS01datafile 'D:\app\Administrator\oradata\orcl\CCFOCUS01.dbf'size 100Mautoextend on next 32Mmaxs 阅读全文
摘要:
1) select * from T1 where exists(select 1 from T2 where T1.a=T2.a) ; T1数据量小而T2数据量非常大时,T1<<T2 时,1) 的查询效率高。2) select * from T1 where T1.a in (select T2. 阅读全文
摘要:
--用户名:tms--创建表ts_dictionary的备份create table ts_dictionary_20160715 as select * from ts_dictionary; 补充: --在ts_dictionary中添加一条一账通的数据insert into ts_dictio 阅读全文