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CREATE TABLE user_balances ( amount decimal(9, 2), date datetime, index(date) ); insert into user_balances values (123.45, now()); explain SELECT SUM(amount) as total FROM user_balances WHERE DATE(date)=CURDATE(); explain SELECT SUM(amount) as total FROM user_balances WHERE date between CURDATE() and date_add(CURDATE(), interval 1 day);

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