length求得是字符长度, lengthb求得是字节长度,例子如下:
SQL> select length('新春快乐') from dual;
LENGTH('新春快乐')
------------------
4
SQL> select lengthb('新春快乐') from dual;
LENGTHB('新春快乐')
-------------------
12
length求得是字符长度, lengthb求得是字节长度,例子如下:
SQL> select length('新春快乐') from dual;
LENGTH('新春快乐')
------------------
4
SQL> select lengthb('新春快乐') from dual;
LENGTHB('新春快乐')
-------------------
12