Oracle查询当前用户下的所有表及sqlplus 设置 列宽

如果oracle服务器中装有多个数据库实例，则在用户名处输入：用户名/密码@数据库名称。如果数据库服务器不在本机上，还需要加上数据库服务器的地址：用户名/密码@IP地址/数据库名称。

[oracle@node130 ~]$ sqlplus scott/123456@192.168.8.145/prod

SQL*Plus: Release 11.2.0.3.0 Production on Thu Apr 13 19:49:57 2017

Copyright (c) 1982, 2011, Oracle. All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select table_name from tabs;

TABLE_NAME
------------------------------
DEPT
EMP
BONUS
SALGRADE

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
DEPT
EMP
BONUS
SALGRADE

类型为number的列宽是用99999或999,99的格式来设置的。

99999表示列宽设为五位数，999,99表示列宽设为6位数，因为逗号也算一位。

SQL> select * from dept;

DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON

SQL> col deptno format 9999;
SQL> select * from dept;

DEPTNO DNAME LOC
------ -------------- -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON

设置varchar2类型列的宽度 这里a30表示占30个字符的宽度。

SQL> col dname format a30;
SQL> select * from dept;

DEPTNO DNAME LOC
------ ------------------------------ -------------
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON

查看表结构 decribe tablename

SQL> select table_name from user_tables;

TABLE_NAME
------------------------------
DEPT
EMP
BONUS
SALGRADE

SQL> describe dept;
Name Null? Type
----------------------------------------- -------- ----------------------------
DEPTNO NOT NULL NUMBER(2)
DNAME VARCHAR2(14)
LOC VARCHAR2(13)

SQL> describe emp;
Name Null? Type
----------------------------------------- -------- ----------------------------
EMPNO NOT NULL NUMBER(4)
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SAL NUMBER(7,2)
COMM NUMBER(7,2)
DEPTNO NUMBER(2)

SQL> describe bonus;
Name Null? Type
----------------------------------------- -------- ----------------------------
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
SAL NUMBER
COMM NUMBER

SQL> describe salgrade;
Name Null? Type
----------------------------------------- -------- ----------------------------
GRADE NUMBER
LOSAL NUMBER
HISAL NUMBER