VSIZE(X)

【功能】返回X的大小(字节)数

【参数】x

select vsize(user),user from dual;

返回：6 asdied

select length('adfad合理') "bytesLengthIs" from dual --7
select lengthb('adfad') "bytesLengthIs" from dual --5
select lengthb('adfad合理') "bytesLengthIs" from dual --9
select vsize('adfad合理') "bytesLengthIs" from dual --9
select lengthc('adfad合理')"bytesLengthIs" from dual --7
lengthb=vsize
lengthc=length