Then WeekDay returns 5, which corresponds to Thursday. (Assume the current date is Wednesday, July 5, 2009.)įirst the DateAdd function adds one day to the current date, resulting in a date of Thursday, July 6, 2009. Read more about TOCHAR () in the Oracle manual. To get the corresponding four-digit year, use SELECT TOCHAR ( datecol, 'IYYY') FROM.
#Oracle sql week number how to#
The DayName function extracts the name of the day of the week from a given date. Week numbers in Oracle How to get the week number from a date To get the ISO week number (1-53) from a date in the column datecol, use SELECT TOCHAR ( datecol, 'IW') FROM. WeekDay is most often used with the DayName function. The system returns the number of the day of the week, from 1 to 7, as shown here: If the Locale INI option offers no value, the system defaults to USD (United States/English). If you omit this parameter, the system checks the Locale INI option. The default is the current date.Įnter a valid date format that describes the format used by your entry in the Date parameter.
Syntax WeekDay (Date, Format, Locale) The system returns the number of the day of the week, from 1 to 7, as shown here: WeekDay is most often used with the DayName function. The system assumes your entry is in the format specified by the Format parameter. WeekDay Use this function to determine the day of the week in a given date and return the value as a number. Use this function to determine the day of the week in a given date and return the value as a number.
You are here: Function Reference > Alphabetical Listing > W > WeekDay WeekDay So: to find the week number for any date dt, compute 1 + ( trunc (dt, 'iw') - trunc (date '', 'iw') ) / 7 This formula finds the Monday of the ISO Week of dt and subtracts the first Monday of the year - using Oracle date arithmetic, where the difference between two dates is the number of days between them.
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