Explanation Data validation rules are triggered when a user adds or changes a cell value. Each time a number is entered, the validation is triggered. As long as the sum remains less than 1000, validation succeeds. If any entry causes the sum C6:C9 to exceed 1000, validation fails. These values can be numbers, cell references, ranges, arrays, and constants, in any combination. SUM can handle up to 255 individual arguments.

Explanation Data validation rules are triggered when a user adds or changes a cell value. The COUNTIF function simply counts occurrences of the value in the list. Any count greater than zero will pass validation. COUNTIF can be used to count…

Explanation Data validation rules are triggered when a user adds or changes a cell value. EXACT performs a case-sensitive comparison. If the two text strings match exactly, EXACT returns TRUE and validation will pass. If the match fails, EXACT will return FALSE, and input will fail validation. For example, =LEFT(“apple”,3) returns “app”. COUNTIF can be used to count…

Explanation Data validation rules are triggered when a user adds or changes a cell value. If found, FIND will return a numeric position (i.e. 2, 4, 5, etc.) to represent the starting point of the text in the cell. If the text is not found, FIND will return an error. The result returned by the FIND function is then evaluated by the ISNUMBER function. For any numeric result returned by FIND, ISNUMBER will return TRUE and validation will succeed....

Data validation rules are triggered when a user adds or changes a cell value. The search logic is “contains” by default because of how SEARCH works. If not found, SEARCH returns an error. After ISNUMBER evaluates the results from SEARCH we have an array of TRUE and FALSE values. As long as all items are zero, SUMPRODUCT returns zero and validation succeeds. If SUMPRODUCT returns a positive number, an invalid value has been found....

Explanation Data validation rules are triggered when a user adds or changes a cell value. The COUNTIF function simply counts occurrences of the value in the list. As long as the count is zero, the entry will pass validation. If the count is not zero (i.e. the user entered a value from the list) validation will fail. COUNTIF can be used to count…

Explanation Data validation rules are triggered when a user adds or changes a cell value. When a custom formula returns TRUE, validation passes and the input is accepted. When a formula returns FALSE, validation fails and the input is rejected with a popup message. In this case, we have previously defined thenamed range"xlist" as D5:D11. This range holds characters that are not allowed. Next, the COUNT function returns the count of all numbers in the array....

Explanation Data validation rules are triggered when a user adds or changes a cell value. The AND function takes multiple arguments (logicals) and returns TRUE only when all arguments return TRUE. The DATE function creates a proper Excel date with given year, month, and day values. If either condition is FALSE, AND returns FALSE and input fails data validation. AND returns TRUEonly if all the conditions are met. If any conditions are not met, the AND function returns FALSE....

In the worksheet shown, the multiple is 100. Data validation rules are triggered when a user adds or changes a cell value. When a custom formula returns TRUE, validation passes and the input is accepted. When the formula returns FALSE, validation fails and the input is rejected. We can do this with the MOD function. MOD function TheMOD functionreturns the remainder of two numbers after division. The formula used to validate input looks like this:...

Explanation Data validation rules are triggered when a user adds or changes a cell value. The AND function takes multiple arguments (logical expressions) and returns TRUE only when all arguments return TRUE. If the count is less than 2, the logical expression returns TRUE. Be aware that numeric input includes dates and times, whole numbers, and decimal values. AND returns TRUEonly if all the conditions are met. If any conditions are not met, the AND function returns FALSE....

The result is an array like this: which goes into MATCH as the lookup value. If MATCH doesn’t find a match any character, it returns #N/A instead of a number. In that case, the counts don’t match and data validation fails. MATCH supports approximate and exact matching, andwildcards(* ?) Numbers include negative numbers, percentages, dates, times, fractions, and formulas that return numbers. LEN will also count characters in numbers, but number formatting is not included....

Explanation Data validation rules are triggered when a user adds or changes a cell value. If the count is less than 2, the expression returns TRUE and validation succeeds. If not, the expression returns FALSE and validation fails. COUNTIF can be used to count…

Explanation The Excel TRUNC function does no rounding, it just returns a truncated number. It has an optional second argument (num_digits) to specify precision. Whennum_digitsis not provided, it defaults to zero. Additional conditions can be added with the AND function. Notes: Data validation rules are triggered when a user adds or changes a cell value. For example, TRUNC(4.9) will return 4, and TRUNC(-3.5) will return -3. The TRUNC function does no rounding, it simply truncates as specified....