易报修系统数据库怎么建表呢?
1、直接创建:create table t(name varchar2(50 char)); 2、创建与表A结构相同的空表:create table a_tmp as select * from A where 1=0; 3、复制表A全部(或部分)数据:create table a_tmp as select * from A (where a.xxx=xxx)
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1、直接创建:create table t(name varchar2(50 char)); 2、创建与表A结构相同的空表:create table a_tmp as select * from A where 1=0; 3、复制表A全部(或部分)数据:create table a_tmp as select * from A (where a.xxx=xxx)