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5. Monthly revenue easy
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Instruction

  • Write a query to return the total movie rental revenue for each month.
  • You can use EXTRACT(MONTH FROM colname) and EXTRACT(YEAR FROM colname) to extract month and year from a timestamp column.

Table: payment

Movie rental payment transactions table

   col_name   | col_type
--------------+--------------------------
 payment_id   | integer
 customer_id  | smallint
 staff_id     | smallint
 rental_id    | integer
 amount       | numeric
 payment_ts   | timestamp with time zone

Sample results 

 year | mon |   rev
------+-----+----------
 2020 |   1 |  123.45
 2020 |   2 |  234.56
 2020 |   3 |  345.67