[20171218]字段命名与oracle关键字.txt
--//再次提醒开发应该在数据库字段命令上避开oracle关键字(保留字).避免出现混乱.
SCOTT@book> @ &r/ver1
PORT_STRING VERSION BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
SCOTT@book> create table t2 ( user varchar2(20));
create table t2 ( user varchar2(20))
*
ERROR at line 1:
ORA-00904: : invalid identifier
--//user是保留字.
SCOTT@book> create table t2 ( "USER" varchar2(20));
Table created.
SCOTT@book> insert into t2 values ('aaaa');
1 row created.
SCOTT@book> commit ;
Commit complete.
SCOTT@book> select user from t2;
USER
------
SCOTT
--//返回当前用户名.
SCOTT@book> select user,"USER" from t2;
USER USER
------ -----
SCOTT aaaa
SCOTT@book> select * from v$reserved_words where KEYWORD='USER' ;
KEYWORD LENGTH R R R R D
------------------------------ ---------- - - - - -
USER 4 N N N Y N
