mysql中按每天每周每月每年查詢

查詢每天的數據

SELECT
    COUNT(1) AS countNumber,
    DATE_FORMAT(createTime,'%Y-%m-%d') AS dateTime
FROM
    testTable
GROUP BY DATE_FORMAT(createTime,'%Y-%m-%d')

COUNT(1) AS countNumber 統計1字段的結果計數並重命名為countNumber

DATE_FORMAT(createTime,'%Y-%m-%d') AS dateTime 統計每天的數據並重命名為dateTime
testtable 查詢的表
GROUP BY DATE_FORMAT(createTime,'%Y-%m-%d') 分組顯示每天的結果

查詢每周的數據：

SELECT
    COUNT(1) AS countNumber,
    WEEK(createTime) as dateTime
FROM
    testTable
GROUP BY WEEK(createTime) 

查詢每月的數據：

SELECT
    COUNT(1) AS countNumber,
    MONTH(createTime) as dateTime
FROM
    testTable
GROUP BY MONTH(createTime)

查詢每年的數據：

SELECT
    COUNT(1) AS countNumber,
    YEAR(createTime) as dateTime
FROM
    testTable
GROUP BY YEAR(createTime)

其他日期查詢：

DATE_ADD(createTime,INTERVAL 1 DAY)           得到指定日期后一天的日期/把1改為任意數字就可以得到后N天的日期

DATE_SUB(createTime,INTERVAL 1 DAY)           得到指定日期前一天的日期/把1改為任意數字就可以得到前N天的日期

申明變量查詢：

SET @counter=0;
select @counter:=@counter+1 as id,count(*) as num FROM testTable ORDER BY num desc

資料引用：https://blog.csdn.net/h363659487/article/details/74452350