TO_CHAR函数的Oracle / PLSQL,数字或日期转换为一个字符串。
to_char函数的语法是:
to_char( value, [ format_mask ], [ nls_language ] )
值可以是数字或日期将被转换为一个字符串。
format_mask是可选的。这是将要使用的格式转换成一个字符串值。
NLS_LANGUAGE是可选的。这是免入息审查贷款计划的语言,用于转换为字符串的值。
Applies To:
代码如下 | 复制代码 |
Oracle 8i, Oracle 9i, Oracle 10g, Oracle 11g |
实例
代码如下 | 复制代码 |
to_char(1210.73, '9999.9') would return '1210.7' |
日期实例
下面是一个有效参数列表to_char函数是用来转换为一个字符串的日期。这些参数可用于在多种组合。
Parameter | Explanation |
---|---|
YEAR | Year, spelled out |
YYYY | 4-digit year |
YYY YY Y |
Last 3, 2, or 1 digit(s) of year. |
IYY IY I |
Last 3, 2, or 1 digit(s) of ISO year. |
IYYY | 4-digit year based on the ISO standard |
Q | Quarter of year (1, 2, 3, 4; JAN-MAR = 1). |
MM | Month (01-12; JAN = 01). |
MON | Abbreviated name of month. |
MONTH | Name of month, padded with blanks to length of 9 characters. |
RM | Roman numeral month (I-XII; JAN = I). |
WW | Week of year (1-53) where week 1 starts on the first day of the year and continues to the seventh day of the year. |
W | Week of month (1-5) where week 1 starts on the first day of the month and ends on the seventh. |
IW | Week of year (1-52 or 1-53) based on the ISO standard. |
D | Day of week (1-7). |
DAY | Name of day. |
DD | Day of month (1-31). |
DDD | Day of year (1-366). |
DY | Abbreviated name of day. |
J | Julian day; the number of days since January 1, 4712 BC. |
HH | Hour of day (1-12). |
HH12 | Hour of day (1-12). |
HH24 | Hour of day (0-23). |
MI | Minute (0-59). |
SS | Second (0-59). |
SSSSS | Seconds past midnight (0-86399). |
FF | Fractional seconds. |
The following are date examples for the to_char function.
代码如下 | 复制代码 |
to_char(sysdate, 'yyyy/mm/dd'); would return '2003/07/09' to_char(sysdate, 'Month DD, YYYY'); would return 'July 09, 2003' 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' |
你会发现,在一些例子中,format_mask参数与“FM”开始。这意味着,零和空格被抑制。这在下面的例子可以看出。
代码如下 | 复制代码 |
to_char(sysdate, 'FMMonth DD, YYYY'); would return 'July 9, 2003' |