查詢每天的資料：
select
count(1) as countnumber,
date_format(createtime,'%y-%m-%d') as datetime
from
testtable
group by date_format(createtime,'%y-%m-%d')
查詢每週的資料：
select
count(1) as countnumber,
week(createtime) as datetime
from
testtable
group by week(createtime)
查詢每月的資料：
select
count(1) as countnumber,
month(createtime) as datetime
from
testtable
group by month(createtime)
查詢每年的資料：
select
count(1) as countnumber,
year(createtime) as datetime
from
testtable
group by year(createtime)
其它：date_add(createtime,interval 1 day) 得到指定日期後一天的日期/把1改為任意數字就可以得到後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
宣告變數查詢：
set @counter=0;
select @counter:=@counter+1 as id,count(*) as num from testtable order by num desc
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