sql随笔

sql随笔

查询当日

select '字段’ from '表名'
where to_days('日期字段') = to_days(now())

查询当月

SELECT * FROM '表名'
WHERE DATE_FORMAT( '日期字段', '%Y%m' ) = DATE_FORMAT( CURDATE() , '%Y%m')

查询排序名次

select * from(select id,name,mingci,(@ranknum:= @ranknum+ 1) as rownum（虚拟排序字段） from 表名,(select(@ranknum := 0))b （表别名）
where '内条件' order by 排序的字段 desc) 表名
where '外条件'

最近月

SELECT DATE_FORMAT(CURDATE(), '%Y-%m') AS year_month
UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 1 MONTH), '%Y-%m') AS year_month
UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 2 MONTH), '%Y-%m') AS year_month
UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 3 MONTH), '%Y-%m') AS year_month
UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 4 MONTH), '%Y-%m') AS year_month
UNION SELECT DATE_FORMAT((CURDATE() - INTERVAL 5 MONTH), '%Y-%m') AS year_month