The finance department wants to know how much interest has been collected for each loan type. Return loan_type and total_interest (sum of interest_paid from payments). Sort by total_interest descending.
Schema
🔑idINT
🔗customer_idINT
loan_typeTEXT
principalREAL
interest_rateREAL
term_monthsINT
start_dateTEXT
statusTEXT
postgresql
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