（1）用作日期轉換：

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;

（2）處理數字：

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;

（3）to_char(salary,'$99,99');

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

（4）用于進制轉換：將10進制轉換為16進制；

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

例子：

to_char 例子

①其9代表：如果存在數字則顯示數字，不存在則顯示空格

②其0代表：如果存在數字則顯示數字，不存在則顯示0，即占位符。

③其FM代表：刪除如果是因9帶來的空格，則刪除之

to_char(now(),'Day, HH12:MI:SS') 'Tuesday , 05:39:18' to_char(now(),'FMDay, HH12:MI:SS') 'Tuesday, 05:39:18' to_char(-0.1,'99.99') ' -.10' to_char(-0.1,'FM9.99') '-.1' to_char(0.1,'0.9') ' 0.1' to_char(12,'9990999.9') ' 0012.0' to_char(12,'FM9990999.9') '0012' to_char(485,'999') ' 485' to_char(-485,'999') '-485' to_char(485,'9 9 9') ' 4 8 5' to_char(1485,'9,999') ' 1,485' to_char(1485,'9G999') ' 1 485' to_char(148.5,'999.999') ' 148.500' to_char(148.5,'999D999') ' 148,500' to_char(3148.5,'9G999D999') ' 3 148,500' to_char(-485,'999S') '485-' to_char(-485,'999MI') '485-' to_char(485,'999MI') '485' to_char(485,'PL999') '+485' to_char(485,'SG999') '+485' to_char(-485,'SG999') '-485' to_char(-485,'9SG99') '4-85' to_char(-485,'999PR') '<485>' to_char(485,'L999') 'DM 485 to_char(485,'RN') ' CDLXXXV' to_char(485,'FMRN') 'CDLXXXV' to_char(5.2,'FMRN') V to_char(482,'999th') ' 482nd' to_char(485, '"Good number:"999') 'Good number: 485' to_char(485.8,'"Pre-decimal:"999" Post-decimal:" .999') 'Pre-decimal: 485 Post-decimal: .800' to_char(12,'99V999') ' 12000' to_char(12.4,'99V999') ' 12400' to_char(12.45, '99V9') ' 125'

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轉載于:https://www.cnblogs.com/sjxbg/p/10073409.html

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