Oracle DBA培训:转换单行函数
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我要咨询To_char
select to_char(sysdate,'yyyy') from dual;
select to_char(sysdate,'fmyyyy-mm-dd') from dual;
select to_char(sal,'L999,999,999') from emp;
select to_char(sysdate,’D’) from dual;//返回星期
To_number
select to_number('13')+to_number('14') from dual;
To_date
Select to_date("20090210","yyyyMMdd") from dual;