mysql統計函數

參考：

http://c.biancheng.net/mysql/function/（編程網：MySQL函數大全）

https://www.cnblogs.com/lazyInsects/p/8006388.html（mysql統計數據）

https://www.cnblogs.com/poloyy/p/12890763.html（常用函數匯總）

一，時間查詢

/*查詢2小時前的數據*/
select * from tableName WHERE
        create_time < DATE_SUB(NOW(), INTERVAL 2 HOUR)
#7天前
SELECT count(id) FROM rd_track_info WHERE
DATE(create_time) < DATE_SUB(CURDATE(), INTERVAL 7 DAY);

 

二，統計數據

/*按天統計*/
SELECT
    count(id) countNum,
    DATE(create_time) createTime
FROM
    rd_track_info
GROUP BY
    DATE(create_time)
ORDER BY
    DATE(create_time) DESC;
/*按周統計*/
SELECT
    count(id) countNum,
    WEEK(create_time) createTime
FROM
    rd_track_info
GROUP BY
    WEEK(create_time)
ORDER BY
    WEEK(create_time) DESC;


/*按月統計*/
SELECT
    count(id) countNum,
    MONTH(create_time) createTime
FROM
    rd_track_info
GROUP BY
    MONTH(create_time)
ORDER BY
    MONTH(create_time) DESC;


/*按季度統計*/
SELECT
    count(id) countNum,
    QUARTER(create_time) createTime
FROM
    rd_track_info
GROUP BY
    QUARTER(create_time)
ORDER BY
    QUARTER(create_time) DESC;

/*按年統計*/
SELECT
    count(id) countNum,
    YEAR(create_time) createTime
FROM
    rd_track_info
GROUP BY
    YEAR(create_time)
ORDER BY
    YEAR(create_time) DESC;