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  • 多条件排序及时间对比查询

     知识点:

    1.多个条件排序,直接用order by 后面接几个排序规则,优先1则放在第一个

    2.结束时间大于等于当前时间 用结束时间字段与 now() 对比

    3.名称正序排序使用gbk格式,即首字母排序  convert(substr(字段名,1,1) using 'GBK') 

    业务场景:

    SELECT c.ClassName,c.StartEnrollTime,c.EndEnrollTime FROM class c
    left join classclassify cc on cc.ClassId=c.Id
    left join classify cf on cf.id = cc.ClassifyId
    WHERE c.TYPE=2 AND c.SchoolId=61 and c.IsDeleted=0
    and c.IsOpenEnroll=1 and c.IsOver=0 and c.IsPublish=1 and c.IsEnrollHide=0
    and c.EndEnrollTime >= now()
    ORDER BY c.StartEnrollTime desc,c.EndEnrollTime ASC
    ,convert(substr(c.ClassName,1,1) using 'GBK') ASC ;

     

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  • 原文地址:https://www.cnblogs.com/dieyaxianju/p/7602548.html
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