oracle中rpad函数和lpad函数

语法：LPAD(expr,n[,pad])

　　　　RPAD(expr,n[,pad])

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SQL*Plus: Release 11.2.0.1.0 Production on 星期三 11月 16 16:26:42 2011

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连接到: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select lpad('test',20,'-') from dual;

LPAD('TEST',20,'-')

--------------------

----------------test

SQL> select lpad('test',3,'-') from dual;

LPA

---

tes

SQL> select rpad('test',3,'-') from dual;

RPA

---

tes

SQL> select rpad('test',20,'-') from dual;

RPAD('TEST',20,'-')

--------------------

test----------------

SQL>