MySQL实现按分秒统计数据量方式

SELECT 
    DATE_FORMAT(transaction_time, '%Y-%m-%d %H:%i:%s') AS time_sec, 
    COUNT(*) AS transaction_count
FROM transactions
GROUP BY time_sec
ORDER BY time_sec DESC;

SELECT 
    DATE_FORMAT(transaction_time, '%Y-%m-%d %H:%i') AS time_min, 
    COUNT(*) AS transaction_count
FROM transactions
GROUP BY time_min
ORDER BY time_min DESC;

SELECT 
    CONCAT(DATE_FORMAT(transaction_time, '%Y-%m-%d %H:'), 
           LPAD(FLOOR(MINUTE(transaction_time) / 5) * 5, 2, '0')) AS time_5min, 
    COUNT(*) AS transaction_count
FROM transactions
GROUP BY time_5min
ORDER BY time_5min DESC;

SELECT 
    CONCAT(DATE_FORMAT(transaction_time, '%Y-%m-%d %H:'), 
           LPAD(FLOOR(MINUTE(transaction_time) / 10) * 10, 2, '0')) AS time_10min, 
    COUNT(*) AS transaction_count
FROM transactions
GROUP BY time_10min
ORDER BY time_10min DESC;

SELECT 
    CONCAT(DATE_FORMAT(transaction_time, '%Y-%m-%d %H:'), 
           LPAD(FLOOR(MINUTE(transaction_time) / 30) * 30, 2, '0')) AS time_30min, 
    COUNT(*) AS transaction_count
FROM transactions
GROUP BY time_30min
ORDER BY time_30min DESC;

SELECT 
    DATE_FORMAT(transaction_time, '%Y-%m-%d %H:%i') AS time_min, 
    COUNT(*) AS transaction_count
FROM transactions
WHERE transaction_time >= NOW() - INTERVAL 1 DAY
GROUP BY time_min
ORDER BY time_min DESC;