In the bottom right corner of each table, you can find so called "Mathematical functions" in Tabidoo.

Those functions help you to ease your work by summing the field/column values.

Where to find mathematical functions in Tabidoo

After clicking on the "Sum" icon, each field/column which has the field type - number, decimal or date will have the option to - sum the values, appear the minimum value or the maximum or show the average value of the column.

Mathematical functions in Tabidoo