MissingFallback gives the first of its arguments that is not of the form Missing[…]:

If only missing elements are present, the last of them will be returned:

Use MissingFallback to replace missing values in a Tabular object with values of another column:

Use a fixed value instead:

Use functions of columns in MissingFallback to fill in missing values in a Tabular object:

Use the sum of row values from other columns:

Use the mean of row values from neighboring columns:

Construct a Tabular object with a column containing the moons of Pluto:

Some of those moons have a Missing["NotAvailable"] value for the "PolarRadius" property:

Use the "Radius" property as fallback:

Take a Tabular object of Palmer penguin data:

Create a pivot table of penguin species and sex distribution over the islands:

The resulting table has missing values:

Use MissingFallback to fill in Missing values to compute total of all female penguins for each island:

If all arguments of MissingFallback are Missing[…] objects, the last one is returned:

The symbol Missing is not treated as a missing object:

Missing[] with no arguments is treated as a missing object: