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>
