mysql查询天天每周每个月每一年的数据方法

查询天天的数据：

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

查询每周的数据：

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

查询每个月的数据：

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

查询每一年的数据：

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

其它：

DATE_ADD(createTime,INTERVAL 1 DAY)           获得指定日期后一天的日期/把1改成任意数字就能够获得后N天的日期

DATE_SUB(createTime,INTERVAL 1 DAY)           获得指定日期前一天的日期/把1改成任意数字就能够获得前N天的日期

声明变量查询：

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