QuerydrillTotal revenue from text amounts
An SQL exercise from Querydrill. Solve it with a SQL editor in your browser, checked on the rows it returns and again on changed data, and it is checked the moment you submit.
The task
From Priya in Finance: "The amount column is text, like $1,200.00 and ' 30.50'. What is our total revenue from paid payments? Count a payment as paid whatever the capitals or spaces in its status." Return one number, rounded to 2 decimals.
What this exercise teaches
Numbers stored as text are one of the most common data problems. Convert them once, explicitly, before you add them up.
A hint if you get stuck
Strip the $ and the commas with REPLACE, TRIM the spaces, then CAST(... AS REAL). Match the status with LOWER(TRIM(status)) = 'paid'.
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