MYSQL

标签：asc   cas   left join   main   when   单位   ase   group by   number   

# 查询主表相关信息，并且显示最新的记录
SELECT
type.number             as ‘序号‘,
type.date               as ‘时间‘,
type.name               as ‘名称‘,
main.content            as ‘项目名称‘,
main.manager            as ‘负责人‘,
unit.name               as ‘单位‘,
re.content              as ‘记录‘,
CASE main.status 
        WHEN 1 THEN ‘完成‘
        WHEN 2 THEN ‘正常‘ 
        WHEN 3 THEN ‘滞后‘ 
    END                as ‘状态‘
FROM
	`main`
	LEFT JOIN type ON main.type_id= type.id 
	LEFT JOIN unit ON unit.id = main.qtdw
        # 这里将子查询的结果作为表与主表链接。因为主表与记录表是一对多的关系，故先将结果按时间倒叙查询出来，再将查询的结果分组，这样每个组取到的就是最新的消息了
	LEFT JOIN (SELECT * FROM (SELECT pid,content FROM record ORDER BY created_at DESC) a  GROUP BY pid) re ON wj.pid = main.id 
WHERE
	 main.status in (2,3)	
	AND (
	1 = 1 
	AND main.type_id IN 
	) 
	AND `recovery_status` = 1 
ORDER BY
	type.date DESC,
	type.number DESC,
	main.sort+ 0 ASC 

MYSQL

标签：asc   cas   left join   main   when   单位   ase   group by   number   

原文地址：https://www.cnblogs.com/Aienming/p/14388130.html