oracle週數計算方法
阿新 • • 發佈：2019-01-23
從星期天開始起算
Function Fn_GetWeekbyDate(P_Date Varchar2) Return Varchar2
Is
Begin
Return To_char(To_Date(P_Date,'yyyy-mm-dd'),'fmww');
End Fn_GetWeekbyDate;從星期一開始起算
Function Fn_GetWeekbyDate(P_Date Varchar2) Return Varchar2 Is Begin Return To_char(To_Date(P_Date,'yyyy-mm-dd'),'fmiw'); End Fn_GetWeekbyDate;
下面是一個有效引數列表to_char函式是用來轉換為一個字串的日期。這些引數可用於在多種組合。
| 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. |