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  • 数据库函数-常用的MySQL函数

    1.date_sub() 时间的加减

      备注:record 为datetime类型

          select
                record_time as date,
                order_area as  orderArea,
                order_cnt as orderCnt
            from
                dm_rpt_dss_enterprise_sum
            where
                 seller_enterprise_id = #{enterpriseId}
                 and
                 record_time between  date_sub(#{date},interval 15 day) and  #{date}
            group by
                record_time
            order by
                record_time

    2.date_format() 时间日期格式化

      备注:record 为datetime类型

    select
                DATE_FORMAT(record_time, '%Y-%m-%d') recordTime,
                permeability ,
                orderincrement_30d as orderincrement30d,
    
                active_rate as activeRate,
                noorder_increment_90d as noorderIncrement90d,
                noorder_increment_30_90d as noorderIncrement30_90d,
    
                coverage_rate as coverageRate,
                ptial_cus_excavablearea as ptialCusExcavablearea,
                clue_cus_excavablearea as clueCusExcavablearea
     from
                dm_rpt_dss_enterprise_sum

    3. now()获取当前时间

    4.IFNULL() 处理值为null的情况

    SELECT
                count(distinct customer_id) as customerNum,
                IFNULL( SUM(influence_quantity),0.00)  as influenceQuantity
    FROM 
           customer_early_warning
    WHERE
           to_days(record_time) = to_days(now())        AND seller_enterprise_id = #{sellerEnterpriseId}

    5.convert() 转换函数

    IFNULL( CONVERT ( d.orderArea / 10000, DECIMAL ( 18, 2 ) ), 0.00 ) AS orderArea

     6.concat() 字符串拼接函数

     CONCAT( province, '^', city, '^', area ) AS area

     7.substr() 字符串截取

    SUBSTR( a.record_time, 1, 10 ) >= concat( substr( #{queryDTO.queryDate}, 1, 7 ), '-01' )
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  • 原文地址:https://www.cnblogs.com/july-sunny/p/12418794.html
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