Oracle中to_char()函数的用法

日期转换：

to_char(date,'格式')

select to_date('2005-01-01 ','yyyy-MM-dd') from dual;
select to_char(sysdate,'yyyy-MM-dd HH24:mi:ss') from dual;

对时间戳，加上随机数

update tableName set TB_SAVETIME = TO_TIMESTAMP(to_char(TB_SAVETIME,'YYYY-MM-DD HH24:MI:SS')||to_char(dbms_random.value(0,5)/10000,'9.999999') , 'YYYY-MM-DD HH24:MI:SS.FF6')  ;

处理数字：

to_char(number,'格式')

select to_char(88877) from dual;
select to_char(1234567890,'099999999999999')  from dual;
select to_char(12345678,'999,999,999,999')  from dual;
select to_char(123456,'99.999')  from dual;
select to_char(1234567890,'999,999,999,999.9999')  from dual;

to_char(salary,'$99,99')

 select TO_CHAR(123,'$99,999.9') from dual;

用于进制转换：将10进制转换为16进制

select to_char(4567,'xxxx') from dual;
select to_char(123,'xxx') from dual;

例子：

 1  to_char 例子 
 2 输入    输出
 3 to_char(now(),'Day, HH12:MI:SS')    'Tuesday , 05:39:18'
 4 to_char(now(),'FMDay, HH12:MI:SS')    'Tuesday, 05:39:18'
 5 to_char(-0.1,'99.99')    ' -.10'
 6 to_char(-0.1,'FM9.99')    '-.1'
 7 to_char(0.1,'0.9')    ' 0.1'
 8 to_char(12,'9990999.9')    ' 0012.0'
 9 to_char(12,'FM9990999.9')    '0012'
10 to_char(485,'999')    ' 485'
11 to_char(-485,'999')    '-485'
12 to_char(485,'9 9 9')    ' 4 8 5'
13 to_char(1485,'9,999')    ' 1,485'
14 to_char(1485,'9G999')    ' 1 485'
15 to_char(148.5,'999.999')    ' 148.500'
16 to_char(148.5,'999D999')    ' 148,500'
17 to_char(3148.5,'9G999D999')    ' 3 148,500'
18 to_char(-485,'999S')    '485-'
19 to_char(-485,'999MI')    '485-'
20 to_char(485,'999MI')    '485'
21 to_char(485,'PL999')    '+485'
22 to_char(485,'SG999')    '+485'
23 to_char(-485,'SG999')    '-485'
24 to_char(-485,'9SG99')    '4-85'
25 to_char(-485,'999PR')    '<485>'
26 to_char(485,'L999')    'DM 485
27 to_char(485,'RN')    ' CDLXXXV'
28 to_char(485,'FMRN')    'CDLXXXV'
29 to_char(5.2,'FMRN')    V
30 to_char(482,'999th')    ' 482nd'
31 to_char(485, '"Good number:"999')    'Good number: 485'
32 to_char(485.8,'"Pre-decimal:"999" Post-decimal:" .999')    'Pre-decimal: 485 Post-decimal: .800'
33 to_char(12,'99V999')    ' 12000'
34 to_char(12.4,'99V999')    ' 12400'
35 to_char(12.45, '99V9')    ' 125'

转载来源 ：http://blog.csdn.net/jiangnan2014/article/details/16908585