mysql常用查询语句笔记

统计部分：

按周：
select DATE_FORMAT(create_time,'%Y%u')
weeks,count(caseid)
count from tc_casegroup
by weeks;

按日： select DATE_FORMAT(create_time,'%Y%m%d')
days,count(caseid)
count from tc_casegroup
by days;

按月： select DATE_FORMAT(create_time,'%Y%m')
months,count(caseid)
count from tc_casegroup
by months;

去重计算总数

select count(distinct(过滤字段)) from table where ...;

待续