xloreo.blogg.se - Oracle week number

#Oracle week number how to#
#Oracle week number serial numbers#
#Oracle week number serial number#
#Oracle week number iso#
#Oracle week number plus#

The formula is based on the ISO week date system, where the week starts on Monday and the week containing the 1st Thursday of the year is considered week 1. C5*7 adds the number of weeks multiplied by 7 (the number of days in a week) to get the Monday (start date) of the week in question.įor the end date, we will use the following formula: It calculates the date of the last Monday in the previous year. Suppose we are given the data below:įor start_date, the formula to use will be: We can turn a week number into a date using the WEEKNUM function. Here, we took the return_type argument as 15, which means it will take Friday as day 1 of the week. Let’s see how we can get the week number from the dataset. Suppose we are given the following dates. To understand the uses of the function, let’s consider a few examples: Example 1 WEEKNUM is a built-in function that can be used as a worksheet function in Excel.

#Oracle week number how to#

How to use the WEEKNUM Function in Excel?

A date returned from another function or formula.

A reference to a cell containing a date.

Therefore, the serial_number argument for the WEEKDAY function should be entered as either: Excel interprets text representations of dates differently, depending on the date settings on your computer.

#Oracle week number serial number#

By default, Januis serial number 1, and Januis serial number 39448 because it is 39,448 days after January 1, 1900.

#Oracle week number serial numbers#

MS Excel stores dates as sequential serial numbers so they can be used in calculations.

If we omit the return_type argument, it will take the default value of 1.

It will take Saturday as the first day of week, Saturday = 1, Sunday = 2. It shall take Friday as first day of week so, Friday = 1, Saturday = 2. It will take Thursday as first day of week, so Thursday = 1, Friday = 2. It will take Wednesday as the first day of week, so Wednesday = 1, Thursday = 2. It will take Monday as the first day of week, so Monday = 1, Tuesday = 2. It will take Sunday as the first day of week, so Sunday = 1, Monday = 2.

System 2 – The week containing the first Thursday of the year is numbered week 1.

System 1 – The week containing January 1st is numbered week 1.

Return_type (optional argument) – This specifies which numbering system should be used and which day of the week should be treated as the start of the week.

When entering the argument, we should enter the date using the DATE function or as a result of other formulas or functions.

Serial_number (required argument) – This is an Excel date for which we want to return the week number.

The WEEKNUM uses the following arguments: Thus, the function is particularly useful when planning and scheduling work for business projects. Suppose we wish to determine the time required to complete a certain project, it can be used to remove weekends from the given timeframe. WEEKNUM is quite useful in financial analysis. The function will return an integer that represents a week number from 1 to 52 weeks of the year. It will return the week number of a specific date. By moving the anchor date slightly, you can hardcode any day as the first day of a week.Ĭorrection to your example: if today is 02/mar/2018 then start date is 24/feb/2018 but end date is 02/mar/2018, not 03/mar/2018.The WEEKNUM Function is an Excel DATE and TIME Function.

#Oracle week number plus#

The end date is obviously the start date plus 6 days.

This offset is subtracted from today, giving the closest Saturday before today. (You could use any Saturday before your oldest "today" as the anchor.) The modulo (MOD) expression returns 0 if today is Saturday, 1 if it is Sunday, etc. The above query uses the Julian date (2415026) of the first Saturday in the 20th century (January 6th, 1900) as an anchor point.

If you want to hardcode the week start to Saturday and make it independent of NLS settings, then you need to do some more complex date arithmetic, because TRUNC does not accept NLS_TERRITORY as a direct parameter: It will start on Saturday in Arabic countries. The above query adapts to the week definition for a given territory: the week will start on Sunday in US and on Monday in Europe. If you can control the NLS territory setting (or even better: you want to adapt to it), then the simplest solution is to use TRUNC(SYSDATE,'D') and TRUNC(SYSDATE,'D')+6 :Īlter session set nls_territory='saudi arabia' įrom (select date ''+level today from dual connect by level<=10)