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You can also learn more about other types of expressions.
When an input column is "editable", it can be modified by the user. The Editable_If column constraint is useful to lock down a column (to prevent user edits) depending on the value already in the column or on the values of other columns.
An Editable_If constraint is a condition expression that indicates if a specific column is "editable" in an input form. For instance, ISBLANK([_THIS]) allows edits only if the current value is blank, but once there is a value, the field cannot be edited. Another common use case is to give certain users the ability to edit a field, but make it read-only for others (e.g., USEREMAIL() = "[email protected]").
Examples
("Admin" = USERROLE()) : Only designated app admins. See also USERROLE().
IN(USEREMAIL(), LIST("[email protected]", "[email protected]")) : Only specific users. See also: LIST(), USEREMAIL().
NOT(IN([Employee ID], Employees[Employee ID])) : Only for a new row, but not an existing row. See also: IN(), NOT().
(NOW() < ([Timestamp] + "024:00:00")) : Only if the row is less than a day old. See also NOW().
AND((TIMENOW() >= "08:00:00"), (TIMENOW() < "18:00:00")) : Only during business hours. See also: AND(), TIMENOW().
(WEEKDAY(TODAY()) = 2) : Only on Mondays. See also: TODAY(), WEEKDAY().