Just gimme the code! Here’s an example of a running total:
And here’s the SQL used in the table calculation: 
SUM(${orders.total_order_amount}) OVER (
  ORDER BY
    ${orders.order_date_month}
  ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
)
In general, the SQL used for calculating running totals has two bits (with an optional third bit):
  • column_I_want_to_sum - this is the column with the values you want to add up
  • column_I_want_to_order_by - this is the column you want to order your running total over
  • optional_other_column_I_want_to_order_by - this column is optional and you can add as many more order by columns as you need. For your running total to only go up an increment of one row, you’ll need to add every dimension in your results table to the ORDER BY bit in your SQL. And, the order of these will need to be the same as the ordering you’ve added to the columns in your results table.

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Here’s the SQL you can copy-paste to calculate a running total

SUM(${table.column_I_want_to_sum}) OVER (
  ORDER BY
    ${table.column_I_want_to_order_by},
    ${table.optional_other_column_I_want_to_order_by}
  ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
)
💎 Level up your SQL:
  • You can specify if you want to order your columns in ascending order (1, 2, 3, 4) or descending order (4, 3, 2, 1) using the key words ASC and DESC in your ORDER BY clause. By default, a column will be ordered in ascending order - so if you want it ordered ascending, you don’t need to add anything.
SUM(${table.column_I_want_to_sum}) OVER (
  ORDER BY
    ${table.column_I_want_to_order_by} ASC,
    ${table.optional_other_column_I_want_to_order_by} DESC
  ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
)