oracle常用函數介紹
阿新 • • 發佈：2017-07-02
ont number bold alt ould mage 常用函數 字符轉換 rom
字符函數
數學函數
日期函數
轉換函數
to_char(數字/日期)是把日期或數字轉換為字符串
- 將數字轉換成指定格式
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to_char(1210.73, ‘9999.9‘) -- would return ‘1210.7‘ to_char(1210.73, ‘9,999.99‘) -- would return ‘1,210.73‘ to_char(1210.73, ‘$9,999.00‘) -- would return ‘$1,210.73‘ to_char(21, ‘000099‘) -- would return ‘000021‘
- 將日期轉換成指定格式
to_char(sysdate, ‘yyyy/mm/dd‘);--would return ‘2003/07/09‘ select to_char(sysdate, ‘yyyy-mm-dd hh24:mi:ss‘) from a; ------> 2015-08-28 14:43:15 select to_char(sysdate, ‘yyyy-mm-dd hh12:mi:ss‘) from a; ------> 2015-08-28 02:43:15 to_char(sysdate, ‘yyyy/mm/dd‘);--would return ‘2003/07/09‘ to_char(sysdate,‘
dd-mm-yyyy‘)--按dd-mm-yyyy格式轉換23-05 -2016 to_char(sysdate, ‘Month DD, YYYY‘);--would return ‘10月 21, 2015‘ to_char(sysdate, ‘FMMonth DD, YYYY‘);--would return ‘July 9, 2003‘ to_char(sysdate, ‘MON DDth, YYYY‘);--would return ‘JUL 09TH, 2003‘ to_char(sysdate, ‘FMMON DDth, YYYY‘);--would return ‘JUL 9TH, 2003‘ to_char(sysdate, ‘FMMon ddth, YYYY‘);--would return ‘Jul 9th, 2003‘ to_char(sysdate, ‘FMMonth DD, YYYY‘);--would return ‘July 9, 2003‘ to_char(sysdate, ‘FMMON DDth, YYYY‘);--would return ‘JUL 9TH, 2003‘ to_char(sysdate, ‘FMMon ddth, YYYY‘);--would return ‘Jul 9th, 2003‘
to_number(字符串) 將給出的字符轉換為數字
select to_number(‘123‘) from a ;
常規函數
oracle常用函數介紹