sql优化之统计日期

[出现又离开亅]

SELECT
DATE_FORMAT( apply.CREATE_TIME, '%Y-%m-%d' ) AS dateTime,
sum( CASE WHEN apply.STATUS = '0' THEN '1' ELSE '0' END ) s0,
sum( CASE WHEN apply.STATUS = '1' THEN '1' ELSE '0' END ) s1,
sum( CASE WHEN apply.STATUS = '2' THEN '1' ELSE '0' END ) s2,
sum( CASE WHEN apply.STATUS = '4' THEN '1' ELSE '0' END ) s3
FROM
USER_APPLY apply
WHERE
yearweek( date_format( apply.CREATE_TIME, '%Y-%m-%d' ) ) = yearweek( now() )
GROUP BY dateTime
ORDER BY dateTime ASC


sql如上。统计查询的是本周中，status状态为0,1,2,4的人数各有多少。结果如下：




有一点需要改进的是，某天没有数据时，默认全部统计为0，而不是不显示这个日期。求教大神怎么优化一下，自己学术不到家，搞不出来了。

[明白畅达]

select count（*） as people ， stutas FROM USER_APPLY where yearweek( date_format( apply.CREATE_TIME, '%Y-%m-%d' ) ) = yearweek( now() ) group by stutas

[RockeyCui]

某天没数据默认补0，一般采取left join 处理。先生成时间段，在 left join 统计。
https://blog.csdn.net/yugong_/article/details/105749662