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To limit the entry to a date within a specified range, you can use either the predefined Date rule with the "between" criteria or make a custom validation rule with this generic formula: Please notice that the boundary dates are locked with absolute cell references.

To restrict a user to entering only weekdays or weekends, configure a custom validation rule based on the WEEKDAY function.

Eine detaillierte Beschreibung für eine Vorgehensweise zur Validierung von DNA-Extraktionsverfahren sowohl innerhalb eines Labors als auch im Ringversuch wird vorgestellt.

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Surprisingly, none of the inbuilt Excel data validation rules cater for a very typical situation when you need to restrict users to entering only numbers in specific cells.

But this can be easily done with a custom data validation formula based on the ISNUMBER function, like this one: Where D2 is the uppermost cell of the selected range.

Allow only workdays: In many situations, you may want to use today's date as the start date of the allowed date range.

To get the current date, use the TODAY function, and then add the desired number of days to it to compute the end date.

Der Eignungstest extrahierter DNA erfolgt schwerpunktmäßig durch die Bestimmung amplifizierbarer DNA mittels real-time PCR.

Weitere Untersuchungen sind die Bestimmung der DNA-Konzentration und des Fragmentierungsstatus mittels Gel-Elektrophorese.If the same value already exists in the specified range (count greater than 1), COUNTIF returns FALSE and the input fails validation.Please pay attention that we lock the range with absolute cell references (A:$A) and use a relative reference for the top cell (A2) to get the formula to adjust properly for each cell in the validated range.For example, to limit the data entry to 6 days from now (7 days including today), we are going to use the built-in Date rule with the formula-based criteria: For starters, copy your validation formula into some cell to make sure it does not return an error such as #N/A, #VALUE or #DIV/0! If you are creating a custom rule, the formula should return the logical values of TRUE and FALSE or the values of 1 and 0 equating to them, respectively.If you use a formula-based criteria in a built-in rule (like we did to validate times based on the current time), it can also return another numeric value.With the argument set to 2, WEEKDAY returns an integer ranging from 1 (Monday) to 7 (Sunday).

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